Merge pull request #27 from jcabi/master

merge from master to my repo
Issue #296  - RtPublicKey is getting wrong URI
Merge pull request #297 from lthuangiang/296

#297: pull request Issue #296 - RtPublicKey is getting wrong URI
Issue #179: Added a test for Pull.Smart.issue()
Issue #179: Implemented Pull.Smart.issue()
Merge pull request #28 from jcabi/master

merge to my branch
Issue #299 - The iterate method  in RtPublicKeys was implemented
Merge pull request #302 from lthuangiang/299

#302: pull request Issue #299 - The iterate method  in RtPublicKeys was implemented
Merge pull request #298 from asinyagin/issue179

#298: pull request Issue #179