Setup projectile

 - Uninstall ctags
 - Fix projectile recipe with el-get-sources
 - Add projectile init file and ignore files
Move bookmark files into ./var/bookmark/
Migrate from MMM mode to web-mode

 - Uninstall html5 and MMM mode
 - Disable nxml mode on html file
 - Enable emmet, rainbow-mode and smartparens on web-mode
Add smartrep key for web-mode