Indent Colors
Extract Header mixin

Was unrealate to the color mixin, so extracted it to its own sheet
Reindent Grid fix-ie7
Use placeholders for Grid fix-ie8
Refactor Form SCSS and added placeholders

- Inlined mixins that were just called internally
- Some TODOs for follow up
- Add dash to [class*="span-"] to match other instances
- Should be looked at further
Use placeholders for Grid Module
Refactor Grid Table

- Inline table mixin as it was a single use
- Indent some inline rules
Reindent Grid Thermometer
Use placeholders for Grid util-mobile

TODO for follow up
Use placeholders for Grid util-print

- Hoist native elements
Use placeholders for Grid util-screen

- TODO for follow up
Remove BOM from Header Sass