Issue #63 Renamed class prefixes from Gh* to Rt*. Javadoc comments were
changed where appropriate.
Merge branch 'master' into 63

Conflicts:
	src/main/java/com/jcabi/github/GhGists.java
	src/main/java/com/jcabi/github/GhMarkdown.java
	src/main/java/com/jcabi/github/GhPulls.java
Issue #63 Updated references to DefaultGitHub -> RtGithub from README.md
and index.md.vm
Merge pull request #65 from carlosmiranda/63

#65: pull request Issue #63 Renamed class prefixes from Gh* to Rt*. Javadoc comments were
Merge pull request #6 from jcabi/master

merge from master