Design Refinements, Sass, Keycode for Launching

Hey, @outcoldman and @artemgrygor,

I made a bunch of refinements. If you see anything that doesn't feel right, let me know. But the main things I changed were:

1. Some jQuery (totally hacked in there to get around my confusion with require.js) for the settings overlay. Let me know what I can do to put this code into it's own file and require it. :(

2. Broke up CSS into modules using Sass. I'll probably start rewriting a few things in SCSS along the way, but right now I'm just using it for compiling and compression.

3. Changed the key command for launching the selected bookmark to Cmd/Ctrl + Enter for less confusion with hit enter to run a search. Let me know what you guys this about this. Also, Issue #94 came to my attention.

4. Removed Pace preloader. Seemed redundant. There's already a lot going on visually to let you know content is loading.