Clean up the base Sass styles

![editing__duplicate_of_resource___modx_revolution](https://f.cloud.github.com/assets/234237/1330621/1eaf9ff0-3532-11e3-9075-ee8d897e859b.png)

This doesn't visually change anything, but makes the base Sass organization start to make sense. Removes needless/empty files, redundant style declarations, hundreds of empty lines, hard-coded font declarations, moves styles to the appropriate locations, and orders things in a way that makes much more sense.

More to come, but this is a minimal baseline start.