New design

根据新配色方案重新设计的图标
https://kuler.adobe.com/Hustbook-Color-Swatch-color-theme-2660026/
Optimized new logo design
Update favicon.ico
Updated fontawesome to 3.2.1
New design implementations

deprecated Flat-UI
built a new UI kit based on color schemes
added two-column layout to feeds
Merge pull request #6 from akasfei/master

Conflicts:
	public/category.html

New design, icon, color scheme, etc.
Updated font-awesome to 3.2.1
Deprecated Flat-UI, built a new UI kit on color schemes from the new design
Feeds now uses two-column layout