Reorganize README to make installation easier to execute

#35
Reorder RR features so Read Receipts comes first

This is the first basic thing that people will want to do!
Notifications and digests come later.
Fix feature copy.
Merge branch 'master' of git://github.com/chrislloyd/readraptor into chrislloyd-master

Conflicts:
	assets/stylesheets/modules/_features.scss
	public/css/style.css