Issue #56 modified int-based compareTo() methods to use integer
primitive instead of creating a new boxed Integer.
Issue #56 Added tests for compareTo of RtIssue, RtPull, MkComment,
MkIssue classes.
Merge branch 'master' into 56

Conflicts:
	src/main/java/com/jcabi/github/RtEvent.java
	src/main/java/com/jcabi/github/RtPull.java
	src/test/java/com/jcabi/github/RtIssueTest.java
	src/test/java/com/jcabi/github/RtPullTest.java
Issue #56 added unit tests for compareTo of RtEvent, MkIssue, RtComment,
MkPull
Merge pull request #85 from carlosmiranda/56

#85: pull request Issue #56 modified int-based compareTo() methods to use int