Simplify DOM manipulations
Add `.VimFxReset` class automatically
Remove unnecessary code
Simplify `utils.createElement`
Call `utils.createElement` consistently
Merge branch 'release-0.5.5' into develop
Merge branch 'develop' into simpler-dom

Conflicts:
	extension/packages/button.coffee
	extension/packages/find.coffee
Merge branch 'master' into develop
Merge branch 'master' into develop
Refactor preferences defaults, prepare for enabling preferences sync
defaults.js
Merge pull request #250 from akhodakivskiy/prefs-refactor

Refactor preferences
Added a few mode arrows to the pagination patterns. Closes #254
Closes #252. Fixed cases where VimFx steals keys from focused XUL menulist
Prevent matching wrong next/prev links (containing random `next`, `more` words)
Another character for next/prev navigation
enhance next/prev follow link
use regexp and pattern order
update default prev/next pref
update comments and shorten code