Updating the googlecompute builder documentation.
scripts: Fix slight bash error
Merge pull request #823 from dmerrick/improvements_to_gce_documentation

Updating the googlecompute builder documentation.
scripts: devcompile works properly in Cygwin
Including the following options:
	group_vars: Path to the local group_vars directory for upload
	host_vars: Path to the local host_vars directory for upload
Added tests
Go formatting with