Add grant_type request parameter to APIs based on OAuth 2.
Fix access_token pattern to support whitespaces between access_token string and colon.
Remove unused imports and variables.
We can set up request method via Verb, so no different body and query parameters required. I removed the body parameters and replaced with query parameters. This is necessary for Google OAuth 2 POST support.
New Google OAuth 2 API.
Merge branch 'lsolova'

Conflicts:
	src/main/java/org/scribe/extractors/JsonTokenExtractor.java