Merge pull request #57 from lthuangiang/master

#57: pull request  Issue #45 was implemented
Issue #42 Removed puzzle corresponding to this issue.
Issue #43 removed puzzle corresponding to the resolution of this issue.
Merge pull request #60 from carlosmiranda/42

Issue #42 Removed puzzle corresponding to this issue.
Merge pull request #61 from carlosmiranda/43

Issue #43 removed puzzle corresponding to the resolution of this issue.
Issue #44 removed @todo comment corresponding to the resolution of this
issue.
Merge pull request #62 from carlosmiranda/44

Issue #44 removed @todo comment corresponding to the resolution of this
Merge pull request #3 from jcabi/master

merge from master to one