This adds hub version to crash report. It includes refactoring of hub version to the `version` package for reusability in `commands` package and `github` package.

Verified from Homebrew that this it can parse the version with this format (https://github.com/Homebrew/homebrew/blob/master/Library/Homebrew/version.rb#L259-L332). The previous URL works for `x.x.x` but not `x.x.x-rc1`.

Ending package name with `vVERSION` allows Homebrew to recognize the build version in `brew install`. See https://github.com/boxen/puppet-hub/pull/10#issuecomment-71783691

Tarballs are traditionally .tar.gz, not .gz.tar

* Friendly OS name for packaged zips
* Options to skip test and toolchain building
* Fix problems running on Windows

This makes our build scripts even more simpler. To build with autoupdate, run `go build -tags autoupdate`

Also fix a output typo in autoupdate which is never runs

* Prefer Ruby script to `gotask` script for packaging task
* Clean up Vagrant file
* Prefer `gox` to `goxc`