Issue 496 MkEvent.json created_at JSON element added.
#269 - MkRepoCommits should be able to get commit.
Issue 386. MkRepo#collaborators() implemented.
Issue #524 MkContents.update() creates commit on update
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.
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.
Merge pull request #561 from aistomin/Issue-386

#561: pull request Issue 386. MkRepo#collaborators() implemented.
Merge pull request #559 from aistomin/Issue-496

#559: pull request Issue 496 MkEvent.json created_at JSON element added.
Merge pull request #562 from longtimeago/524

#562: pull request Issue #524 MkContents.update() creates commit on update
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' into 514