Added `boot2docker version` command
Added the VERSION file
Declare version vars to be injected during build
Added missing GitSHA for `boot2docker version`
Reorder switch cases for consistency
Merge pull request #28 from riobard/feature/cmd-version

Added `boot2docker version` command
Added help message for `version` commmand.
Fixed help message indentation
Merge pull request #31 from riobard/fix/cmd-version-help

Added missing help info for `version` command