issue 506 fixed
added test for "raw" method
added puzzles for test and mock methods
changed stream assertion
Merge pull request #60 from jcabi/master

merge to my repo
merge with master
Issue #593 - fixed
Merge pull request #523 from svarovski/issue-506

#523: pull request issue 506 fixed
Merge pull request #594 from lthuangiang/593

#594: pull request Issue #593