Goodie CSS Changes.

This pull request makes the change from the old style of "per-Goodie CSS slurp and append" to the automatic inclusion style employed by Spice.

As part of this process:
- All `.css` files are renamed in the style of `share/goodie/ia_name/ia_name.css`
- All in-code CSS appenders are removed.
- Static in-line styles are moved to separate files.
- Leaving only per-request dynamic styling in the Goodies code.

Prior to this pull request, the following pieces have been updated to sync with these changes:
- The supporting back-end DDG IA code
- The duckpan application and open source DDG module
- The DuckDuckHack documentation on Goodies CSS

This branch appears in the main `duckduckgo/zeroclickinfo-goodies` repository to help expedite the review and facilitate collaboration on any changes.
Ok, I'm working from my knowledge of the implementation (that the string which appears in the answer is the exact string which will appear in the styled background )... so if testing makes sense without knowing those details, I'll go ahead and do it.