Implemented functional tests for:
 - Gist API;
 - PullRequest API;
 - Repository API;
 - Team API;
 - User API;
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/main/java/org/mule/modules/github/GitHubModule.java
	src/main/java/org/mule/modules/github/ServiceFactory.java
Drafts for
 - Issue API;
 - Watcher API;