Beginning of a color scheme.

Start of a color scheme. I'll put up an image on the Wiki or something so you can see all of the colors. So from this point on you should ONLY use the color variables; you shouldn't specify hex values yourself. You can use the `lighten` and `darken` SASS functions to get different shades.

Here's a link to 5 of the colors:
https://kuler.adobe.com/gymjournals-color-theme-3624952/

Closes #50