Move goodies to new styling mechanism.

- Rename 'style.css' to appropriate ID-based name.
- Remove explicit inclusion of CSS, as it will now be auto-included.
- Update tests which explicitly checked for styling.
SHA: move from inline CSS.
ValarMorghulis: move from inline CSS.
Dice: move from inline CSS.
Unifornify: move from inline CSS.
UltimateAnswer: remove trailing whitespace.
UltimateAnswer: move from inline css
ColorCodes: move from inline css
ResistorColors: move from inline CSS.
ColorCodes.t: test to see if we styled in the correct background.

With the full test below of where the background styling takes place,
this should be sufficient to ensure that we haven't made any wildly
wrong code changes.
ResistorColors/ColorCodes: update new selector names.

Changed to be a bit less generic at the behest of @russellholt
Merge pull request #630 from duckduckgo/mwmiller/easier_css

Goodie CSS Changes.