Merge pull request #46 from jcabi/master

merge from master to my repo
Merge pull request #47 from jcabi/master

merge from master to my repo
Issue #470 - MkPullComments should be able to fetch a single pull comment
Merge pull request #482 from lthuangiang/470

#482: pull request Issue #470 - MkPullComments should be able to fetch a single pull com…