increment Google_Client::LIBVER to 2.2.1 (googleapis#1311) 

update LIBVER constant (googleapis#1243) 

Static Code Analysis with Php Inspections (EA Extended) (googleapis#1174 ) * language level fixes * dead code dropped * one-time use variables inlined * control flow simplifications * changes code review * unnecessary parenthesises dropped * fixed CS

update google/apiclient-servies to v0.9 (googleapis#1128) 

removes errant symlinks 

removes stash logic, adds caching test for MemoryCache (googleapis#1085) 

updates google/apiclient-services to 0.7 (googleapis#1053) 

Fix incorrect function call in UPGRADING.md (googleapis#996) 

adds service account, OAuth, general usage, and proxying to README (g… …oogleapis#972)

Update README for v2.0 stable release (googleapis#968)