Night mode CSS

Further cover for spotlight/promo links
Misc CSS tweaks
Big editor button image

Firefox doesn't like separate x/y values for background-position
Big editor button layout

Margin was being ignored as it wasn't specific enough. Force box-sizing
on the textarea so that the button sits flush with the right side
instead of a few px off.
Merge pull request #394 from gavin19/master

CSS misc/night mode
Roll back to jQuery 1.9.1

Roll the package jQuery back to 1.9.1 to fix the Twitter expandos.

This does work in all 4 browsers.
Merge pull request #395 from gamefreak/support-files

Roll back to jQuery 1.9.1
Merge branch 'master' of https://github.com/honestbleeps/Reddit-Enhancement-Suite into comment-tools
Styling cleanup for the big editor.

* The textarea now grows if the editBar is hidden.
* The wiki TOCs are no longer squished to the left.