Issue #184: Added an integration test for RtGist.fork()
Merge branch 'master' into issue184

Conflicts:
	src/test/java/com/jcabi/github/RtGistITCase.java
Issue #184: Improved RtGistITCase.forksGist()
Issue #184: Fixed documentation
Merge pull request #349 from asinyagin/issue184

#349: pull request Issue #184