Remove deprecated theme settings.

These no longer do anything since alternative asset delivery methods
were deprecated, so it’s potentially confusing to keep them around.
Added template documentation blocks.
Turns off preprocessing on already-minified CSS.

This is totally lame, but fixes issue with IE 8 polyfills and `@import`
declarations.
Tidy up HTML template a bit.
Moves login/registration block stuff to Paraneue DS with the rest of the auth view logic.
Adds HTML5Shiv in Paraneue.
Adds documentation block and removes nonexistent class from node template.
Merge pull request #50 from DoSomething/cleanup-and-shiv

Cleanup and shiv