Updated README, added scss and minified versions. 

# README
Updated readme with some info on file sizes and use cases. 
Should add more documentation about available classes.

# Mathematical-type.min.css
Added a minified version if someone wants to use it in a production environment. Totals 620 bytes.
 
# Mathematical-type.scss
Added a slightly modified version of mathematical-type.css as an scss file. Minor modifications include translating the pixel based width declarations to relative ems. 
For consistency. And the kids. 


![tumblr_me5qipBVtB1r9ydfxo1_500](https://f.cloud.github.com/assets/1748143/252494/36b75f14-8ba2-11e2-873e-cad68c1e1e38.gif)