#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-386
Issue 386. MkRepo#collaborators() implemented.
* extra slash removed.