check commentable behavior extension

[cebe]

check if/how https://github.com/yiiext/commentable-behavior could be merged into this extension

[samdark]

I think we should remove commentable-behavior since it wasn't finished and still in the draft state.

[cebe]

I'd like to review the code and see if there is some nice thing that could live further with comment-module and delete it after that, okay?

[samdark]

Sure. I should mention that using nested set for comments is rarely useful and often just an additional burden so the right decision is to use simplest adjacent list.

It was discussed here: http://yiiframework.ru/forum/viewtopic.php?f=9&t=3385 in Russian but I think it's still worth reading.

btw., please check if there are only my commits in this extension. If not then I probably wrong about code state.