Squashed 'libs/gsutil/' content from commit a28589c

git-subtree-dir: libs/gsutil
git-subtree-split: a28589c847dbc2a7048d7dd94cd92a0558c664ec
Merge commit '325c10ee5a94f747bd50daa8b2a608a0700a9f91' as 'libs/gsutil'
Start over.