Use _.each

We need _.each for object iteration so might as well use it for arrays
as well
upgrade browserify/watchify
use native functions when possible
remove unused lodash functions
add style guide
Add section on how to download quill
Upgrade rich-text

Fixes #236
update dependencies
fix tests for phantomjs
remove unused dependency
Remove iframe and move renderer functions to theme
Move default styles to base theme stylus file
fix grunt dev
fix demos
no longer need to user ownerDocument
Move module styles to stylus files
Prefix all module containers class with ql-
fix toolbar style in demo
no longer need dom.window()
fix multi-cursor