Merge pull request #1052 from angel-kulikov/master

UPD: v0.5.2 release
Merge pull request #1053 from angel-kulikov/master

UPD: initial commit of v0.5.3-dev
#1055
UPD: try to fix #1056
Merge pull request #113 from yupe/master

UPD: merge with yupe/master