Initial commit

This contains the CSS file as it stood on March 21st, 2014, and a README
Markdown file that contains a short, very rough draft-ish explanation of
how it ends up looking in Anki. Specific points about the CSS can be
found in the file itself.
Font size changes; additional comments

Changed a couple of the large font classes to have smaller fonts due to
some spacing issues on cards. Also added some commentary to provide
better documentation for each style.
Font and image size tweaks

I made some of the large fonts smaller, as they weren't fitting well on
a mobile screen. Also tweaked the image sizes a bit.