Merge pull request #592 from wakaber/master

Return back urupchan
Always inject omitted posts' info after op. Fixes #593
Make youtube functions a singleton object
Better 2chru.net support
.webm support
Preload: Ctrl+Click for new posts only (#595)
Enable preload for .webm files
Remove quotes
Add missed space
Version update
Fix addImgs l10n
Fix long op-posts (#580)
Remove SAGE on krautchan
Follow-up
Fix getImgWrap on 2ch.hk (fix webm detector)
Disable sound for webm videos
Version update
Add post send error notification. Close #587.
Add controls to webm
Follow-up