Merge pull request #2 from jcabi/master

merge from master to my repo
Merge pull request #3 from jcabi/master

merge from master to my repo
Merge pull request #5 from jcabi/master

merge from master to my branch
Issue #75 Unit test for GhUser was implemented
Merge pull request #88 from lthuangiang/75

#88: pull request Issue #75 Unit test for GhUser was implemented