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
Store line id as the '_quillLineId' property on the DOM node

Also, remove the 'line' class; doing so allows more pure markup.