.hgignore has wrong rule for assets folder. Described and solved here: http://www.yiiframework.ru/forum/viewtopic.php?f=3&t=10464&p=62389
CHANGELOG record modified
CHANGELOG record modified 2
Merge pull request #2086 from GeXu3/hgignore-assets-folder-error-fix

.hgignore has wrong rule for assets folder