[done] Add Vocaroo embedding support
[done] Use Babel
[done] Use LESS
[done] Use Gulp
[done] Refactor: use ES-2015 features
[done] Embed search results into page (no separate search page)
[done] Limit WebSocket request count per period of time
[done] Implement limiting access by country
[done] Implement plugin support
[done] Improve time correction
[done] Improve hotkeys (add ability to disable a singel hotkey; fix Ctrl+Right, etc.)
[done] Do not show update and auto update buttons in archived threads
[done] Serve local copies of YouTube, Coub and Vocaroo favicons
[done] Use GraphicsMagick instead of ImageMagick
[done] Use SQL storage for archived threads/posts/files
* Optimize HTML structure
* Use WebSockets for trakcing favorite threads
* Add ability to reply to post previews (use floating post form)
* Improve posting speed statistics
* Add thread statistics
* Remove "NO_ACCESS" ban level (retain "READ_ONLY")
* Implement subnet support
* Improve DB structure
* Incapsulate actions (reduce coherence)
* Fix post previews
* Remove some boards and add them to the Wiki as an example of custom boards
* Validate post form before submitting
* Auto save post form