Issue #76 Added test methods for RtIssue.patch() and RtIssue.json()
methods.
Merge branch 'master' into 76
Merge branch 'master' into 76

Conflicts:
	src/test/java/com/jcabi/github/RtIssueTest.java
Merge pull request #81 from carlosmiranda/76

#81: pull request Issue #76 Added test methods for RtIssue.patch() and RtIssue.json()