Provided repo vs. Generated repo #808

Provided repo vs. Generated repo #808
Merge branch 'master' of https://github.com/jcabi/jcabi-github into jcabi-master

Conflicts:
	src/test/java/com/jcabi/github/RtIssueITCase.java
	src/test/java/com/jcabi/github/RtMilestonesITCase.java
Merge branch 'jcabi-master' into issue808
#870 - remove unuse import
Merge remote branch 'fork/issue808'