Merge pull request #561 from angel-kulikov/master

UPD: древовидные комментарии
Merge pull request #562 from angel-kulikov/master

UPD: немного правок по #463
Merge pull request #563 from angel-kulikov/master

fix #463 + append closed issues to changelog
admin panel style fix
Merge remote-tracking branch 'yupe/master'
code style fix
fixed #550, fixed #557
Fixed #429, Fixed #281
small fix
Cache fix + install module fix
Merge pull request #31 from yupe/f0439211f7463a94593851969a4342aa8ef8e756

UPD: merge with yupe/master