support for google cloud storage module
gc_storage rewrite commit 1
gc_storage rewrite commit 2
adding Google Compute Engine modules and inventory plugin
custom user-agent header
address a few review comments
update defaults and help for 'name' and 'instance_names'
Fix typo
Merge pull request #4559 from greenalto/fix_typo

Fix typo
Merge pull request #4395 from erjohnso/devel

adding Google Compute Engine modules and inventory plugin
Merge pull request #4333 from bennojoy/gcs

support for google cloud storage module