Issue #416 Added PullComments methods, created PullComment interface
Issue #416 Added puzzles for MkPullComments methods, added
MkPullComment class
Issue #416 Implemented RtPullComment and RtPullCommentTest
Issue #416 Added RtPullComments and RtPullCommentsTest classes
Issue #416 Addressed review comments
Merge pull request #423 from carlosmiranda/416

#423: pull request Issue #416 Added PullComments methods, RtPullComments method stubs and RtComment implementation