Merge pull request #1682 from obscuren/readme-improvements

Updated README, Added CONTRIBUTING

CONTRIBUTING.md

+If you'd like to contribute to go-ethereum please fork, fix, commit and
+send a pull request. Commits who do not comply with the coding standards
+are ignored (use gofmt!). If you send pull requests make absolute sure that you
+commit on the `develop` branch and that you do not merge to master.
+Commits that are directly based on master are simply ignored.
+
+See [Developers' Guide](https://github.com/ethereum/go-ethereum/wiki/Developers'-Guide)
+for more details on configuring your environment, testing, and
+dependency management.

README.md

 ## Ethereum Go
 
-Ethereum Go Client, by Jeffrey Wilcke (and some other people).
+Official golang implementation of the Ethereum protocol
 
           | Linux   | OSX | ARM | Windows | Tests
 ----------|---------|-----|-----|---------|------
-develop   | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=Linux%20Go%20develop%20branch)](https://build.ethdev.com/builders/Linux%20Go%20develop%20branch/builds/-1) | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=Linux%20Go%20develop%20branch)](https://build.ethdev.com/builders/OSX%20Go%20develop%20branch/builds/-1) | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=ARM%20Go%20develop%20branch)](https://build.ethdev.com/builders/ARM%20Go%20develop%20branch/builds/-1) | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=Windows%20Go%20develop%20branch)](https://build.ethdev.com/builders/Windows%20Go%20develop%20branch/builds/-1) | [![Buildr+Status](https://travis-ci.org/ethereum/go-ethereum.svg?branch=develop)](https://travis-ci.org/ethereum/go-ethereum) [![Coverage Status](https://coveralls.io/repos/ethereum/go-ethereum/badge.svg?branch=develop)](https://coveralls.io/r/ethereum/go-ethereum?branch=develop)
-master    | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=Linux%20Go%20master%20branch)](https://build.ethdev.com/builders/Linux%20Go%20master%20branch/builds/-1) | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=OSX%20Go%20master%20branch)](https://build.ethdev.com/builders/OSX%20Go%20master%20branch/builds/-1) | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=ARM%20Go%20master%20branch)](https://build.ethdev.com/builders/ARM%20Go%20master%20branch/builds/-1) | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=Windows%20Go%20master%20branch)](https://build.ethdev.com/builders/Windows%20Go%20master%20branch/builds/-1) | [![Buildr+Status](https://travis-ci.org/ethereum/go-ethereum.svg?branch=master)](https://travis-ci.org/ethereum/go-ethereum) [![Coverage Status](https://coveralls.io/repos/ethereum/go-ethereum/badge.svg?branch=master)](https://coveralls.io/r/ethereum/go-ethereum?branch=master)
+develop   | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=Linux%20Go%20develop%20branch)](https://build.ethdev.com/builders/Linux%20Go%20develop%20branch/builds/-1) | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=Linux%20Go%20develop%20branch)](https://build.ethdev.com/builders/OSX%20Go%20develop%20branch/builds/-1) | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=ARM%20Go%20develop%20branch)](https://build.ethdev.com/builders/ARM%20Go%20develop%20branch/builds/-1) | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=Windows%20Go%20develop%20branch)](https://build.ethdev.com/builders/Windows%20Go%20develop%20branch/builds/-1) | [![Buildr+Status](https://travis-ci.org/ethereum/go-ethereum.svg?branch=develop)](https://travis-ci.org/ethereum/go-ethereum) [![codecov.io](http://codecov.io/github/ethereum/go-ethereum/coverage.svg?branch=develop)](http://codecov.io/github/ethereum/go-ethereum?branch=develop)
+master    | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=Linux%20Go%20master%20branch)](https://build.ethdev.com/builders/Linux%20Go%20master%20branch/builds/-1) | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=OSX%20Go%20master%20branch)](https://build.ethdev.com/builders/OSX%20Go%20master%20branch/builds/-1) | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=ARM%20Go%20master%20branch)](https://build.ethdev.com/builders/ARM%20Go%20master%20branch/builds/-1) | [![Build+Status](https://build.ethdev.com/buildstatusimage?builder=Windows%20Go%20master%20branch)](https://build.ethdev.com/builders/Windows%20Go%20master%20branch/builds/-1) | [![Buildr+Status](https://travis-ci.org/ethereum/go-ethereum.svg?branch=master)](https://travis-ci.org/ethereum/go-ethereum) [![codecov.io](http://codecov.io/github/ethereum/go-ethereum/coverage.svg?branch=master)](http://codecov.io/github/ethereum/go-ethereum?branch=master)
 
-[![Bugs](https://badge.waffle.io/ethereum/go-ethereum.png?label=bug&title=Bugs)](https://waffle.io/ethereum/go-ethereum)
-[![Stories in Ready](https://badge.waffle.io/ethereum/go-ethereum.png?label=ready&title=Ready)](https://waffle.io/ethereum/go-ethereum)
-[![Stories in Progress](https://badge.waffle.io/ethereum/go-ethereum.svg?label=in%20progress&title=In Progress)](http://waffle.io/ethereum/go-ethereum)
+[![API Reference](
+https://camo.githubusercontent.com/915b7be44ada53c290eb157634330494ebe3e30a/68747470733a2f2f676f646f632e6f72672f6769746875622e636f6d2f676f6c616e672f6764646f3f7374617475732e737667
+)](https://godoc.org/github.com/ethereum/go-ethereum) 
 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/ethereum/go-ethereum?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 
-Automated development builds
-======================
+## Automated development builds
 
 The following builds are build automatically by our build servers after each push to the [develop](https://github.com/ethereum/go-ethereum/tree/develop) branch.
 
@@ -25,8 +24,7 @@ The following builds are build automatically by our build servers after each pus
 * [Windows 64-bit](https://build.ethdev.com/builds/Windows%20Go%20develop%20branch/Geth-Win64-latest.zip)
 * [ARM](https://build.ethdev.com/builds/ARM%20Go%20develop%20branch/geth-ARM-latest.tar.bz2)
 
-Building the source
-===================
+## Building the source
 
 For prerequisites and detailed build instructions please read the
 [Installation Instructions](https://github.com/ethereum/go-ethereum/wiki/Building-Ethereum)
@@ -38,34 +36,31 @@ Once the dependencies are installed, run
 
     make geth
 
-Executables
-===========
+## Executables
 
 Go Ethereum comes with several wrappers/executables found in 
 [the `cmd` directory](https://github.com/ethereum/go-ethereum/tree/develop/cmd):
 
-* `geth` Ethereum CLI (ethereum command line interface client)
-* `bootnode` runs a bootstrap node for the Discovery Protocol
-* `ethtest` test tool which runs with the [tests](https://github.com/ethereum/tests) suite: 
-  `/path/to/test.json > ethtest --test BlockTests --stdin`.
-* `evm` is a generic Ethereum Virtual Machine: `evm -code 60ff60ff -gas
-  10000 -price 0 -dump`. See `-h` for a detailed description.
-* `disasm` disassembles EVM code: `echo "6001" | disasm`
-* `rlpdump` prints RLP structures
+ Command  |         |
+----------|---------|
+`geth` | Ethereum CLI (ethereum command line interface client) |
+`bootnode` | runs a bootstrap node for the Discovery Protocol |
+`ethtest` | test tool which runs with the [tests](https://github.com/ethereum/tests) suite: `/path/to/test.json > ethtest --test BlockTests --stdin`.
+`evm` | is a generic Ethereum Virtual Machine: `evm -code 60ff60ff -gas 10000 -price 0 -dump`. See `-h` for a detailed description. |
+`disasm` | disassembles EVM code: `echo "6001" | disasm` |
+`rlpdump` | prints RLP structures |
 
-Command line options
-====================
+## Command line options
 
 `geth` can be configured via command line options, environment variables and config files.
 
 To get the options available:
 
-    geth --help
+    geth help
 
 For further details on options, see the [wiki](https://github.com/ethereum/go-ethereum/wiki/Command-Line-Options)
 
-Contribution
-============
+## Contribution
 
 If you'd like to contribute to go-ethereum please fork, fix, commit and
 send a pull request. Commits who do not comply with the coding standards