SCSS rewrite

I rewrote everything in SCSS to make it easier to maintain. Features are:

* Better README
    * I fixed typos and whatnot
    * Wrapped to 80 columns (in Markdown, if you don't separate lines with two linebreaks, they are merged into one line)
    * Added sections dealing with usage, compiling, and whatnot
* Compressed CSS output
* Nested, maintainable selectors
* Using the [Compass](http://compass-style.org) SCSS library to provide mixins
    * No more `-vendor` prefixes for CSS3, it's handled by Compass
    * Native IE9/Konqueror support
 * A truer-to-the-original `box-shadow`

In case you don't know about [SASS](http://sass-lang.com), it's CSS preprocessor, with features such as:

* Inlineing `@import`s that reside on the local filesystem
* Variables
* Mixins, that take (optional or required) arguments
* And a slew of other things

There are two sets of syntax, SCSS and SASS. SASS is indent-based (like python), and SCSS is curly-bracket based, preserving compatibility with CSS. I used SCSS because it's easier to learn, but it's **REALLY** easy (`sass-convert input.scss output.sass`) to switch to SASS if you like it better.