Add SASS, Neat, Bourbon and Compass to project. Updated readme
Implement grid system for desktop, tablet and mobile

(12 columns total):
Desktop: 4 columns
Tablet: 3 columns
Mobile: 2 columns
Style photoset photos and hover events
Fix background image path and move repeated styles to mixins
Add social icons
Style iron router progress bar and disable spinner
Finish styling homepage / photoset template