delete api client

git-svn-id: https://plugins.svn.wordpress.org/google-drive-wp-media/trunk@854245 b8457f37-d9ea-0310-8a92-e5e31aec5664
new v0.8

git-svn-id: https://plugins.svn.wordpress.org/google-drive-wp-media/trunk@854246 b8457f37-d9ea-0310-8a92-e5e31aec5664