Некрасов Дмитрий, 2538

**Feeds**:
One can add a feed by URL through menu and delete one through context menu.
There are no preinstalled feeds.
The application only supports pure RSS, so bash.im RSS doesn't work.
There is no check about RSS URL's validity in addition dialog.
**Posts**:
One can refresh feed by clicking the button, but only if there is no refreshing.