Wikia mobile 4.0

Phase 1 of wikiamobile redesign and two new features


1. **Redesign of the WikiaMobile skin**
  - cleaner look
  - designed for better reading experience
  - fixes most annoying things
  - no more collapsed sections
  - TOC that is actually useful
2. **mobile preview in edit page on oasis**
  - see how your edits will look also on a mobile skin
  - preview now will remember your choice so you don't have to change it all the time
3. **wikitext editor for mobile skin**
  - simple wiki text editor so users finally can edit via their mobile phones
  - enabled currently only for logged in users
  - behind the flag, disabled by default
  - disbled for now as we want to add tracking next week and battle test it on test wikis