Cleaning up Settings-View

Several small touchups:

### General
![](http://c.gr4m.com/image/2W2p2c3e2X2L/image)

- Added max-width all on sections; text boxes that are 2000px wide are :poop: 
- Headings are now fixed 16px (same size/line-height as the octicon they are next to)
- text-boxes have slightly more padding to make things 'open and free'

### Packages/Themes
![](http://c.gr4m.com/image/1T0E1k2f1x1L/image)

- Again max-width applies
- added -webkit-line-clamp: 2; to always show only two lines of the description; beautiful webkit feature
- 3 packages/themes per line max (still using bootstrap @kevinsawicki) 

I have additional issues I want to address but will create separate PR's for 'better communication on all things'