#113 RtCommentTest

unit tests for the operations or RtComment
Merge branch 'master' into 113
Merge branch 'master' into 113
#113 code style fixes
contents method added to Repo
Contents interface and Rt class added to API
Content interface added. RtContent and RtContentTest annotated with todo
puzzles
Content interface added. RtContent and RtContentTest annotated with todo
puzzles
Puzzle updated to reflect mock implementation needs.
formated MkRepo class.
Mocks for Contents and Content added.
Todo tests and integrations tests added to RtContents class
Code style issues fix.
commit 1
Merge branch 'master' into 113
Removed checkstyle check for ClassFanOutComplexity in class RtRepo
Merge branch 'master' of https://github.com/jcabi/jcabi-github into 118
#111 milestones() method

milestones() method in MkRepo to return MkMilestones, plus unit tests.
Merge branch 'master' into 113
Merge branch 'master' into 111