cmd/geth: codegansta/cli package renamed to urfave/cli

Negative numbers not properly converted in ABI encoding

Ignore round and curly brackets in strings for indentation level

cmd/geth: fix the keystore path in the accounts help text

cmd/geth: truly randomize console test RPC endpoints

console: fix windows console colors

When converting a negative number e.g., -2, the resulting ABI encoding
should look as follows:
fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe.
However, since the check of the type is for an uint instead of an
int, it results in the following ABI encoding:
0101010101010101010101010101010101010101010101010101010101010102. The
Ethereum ABI
(https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI) says,
that signed integers are stored in two's complement which should be
of the form ffffff.... and not 01010101..... for e.g. -1. Thus, I
removed the type check in numbers.go as well as the function S256
as I don't think they are correct. Or maybe I'm missing something?

eth: don't accept transactions until we sync up with the network

eth/downloader: adaptive quality of service tuning

eth/downloader: make fast sync resilient to critical section fails

core: add missing lock in TxPool.GetTransaction

Fixes #2650

cmd/geth: make console tests more robust

* use --port 0 to avoid p2p port conflicts
* use --maxpeers 0 so it doesn't connect to bootstrap nodes
* use geth.expectExit() to wait for termination

This makes "geth js file.js" terminate again.

eth/downloader: ensure cancel channel is closed post sync

eth/downloader, trie: pull head state concurrently with chain

cmd, console: split off the console into a reusable package

core, core/state, trie: enterprise hand-tuned multi-level caching

core/state: return the starting nonce for non-existent accs (testnet)

eth: enable bad block reports

misc: fix spelling mistake

eth/api: fixed GetCompilers when there is no error creating Solc

common/compiler: support relative path to solc