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)