Remove all SCSS/SASS nonsense

The grunt file was just not processing the .scss files properly. Instead
of wasting time fiddling with this, I decided to just use straight CSS.

See #9.
Change the way images are handled

Bootstrap's icons need to be in a /img/ folder by default. Since I don't
want to touch the default CSS, I renamed the image folder instead.

See #9.
Prevent magnification of AngularJS

AngularJS relies on some naming conventions to do its dependency
injection. If we use minify, it wantonly renames stuff without caring
for those conventions causing all things to break. The solution is to
*not* minify for now.

For more information

https://groups.google.com/d/msg/yeoman-dev/642ocaWEHw8/Q2bN0UTw6sgJ
http://docs.angularjs.org/guide/dev_guide.services.injecting_controllers

See #9.