New Mobile JS and moving into Bootstrap.js

Added fallback for pages that have limited content.
Increase swipe detection chance.
Fix sidebar scrolling
Remove scripts from footer.php
Increase max-width to 1580px from 1500px
Remove a few last bits and bobs from blog.scss
Uncategorised styles explanation.
Move some responsive grid styles into grid.scss
Fix some iOS bugs with Sidebar CSS.
Add new sass posts template to main.scss