#269 - MkRepoCommits should be able to get commit.
Merge pull request #560 from carlos-a-crespo/269

#560: pull request #269 - MkRepoCommits should be able to get commit.
Merge branch 'master' of github.com:aistomin/jcabi-github into Issue-496
Issue 496 MkEvent.json created_at JSON element hardcoded value replaced with current time value.