Merge pull request #62 from jcabi/master

merge to my repo
Merge pull request #63 from jcabi/master

merge to my repo
Merge pull request #64 from jcabi/master

merge to my repo
Merge pull request #65 from jcabi/master

merge to my repo
Merge pull request #66 from jcabi/master

merge to my repo
Issue #568 - Wrong URI of Public Keys API
Merge pull request #655 from lthuangiang/568

#655: pull request Issue #568 - Wrong URI of Public Keys API