First shot at porting Monobook to Vector. The only non-straightforward part is moving...

First shot at porting Monobook to Vector. The only non-straightforward part is moving from a separate rtl.css file to a main.css file we can safely Janus. This is half-done right now. Notable things:
* No longer including rtl.css, instead relying on Janused main.css
* Renamed external.png to external-ltr.png so Janus will pick up on external-rtl.png (already exists)
* Added @embed to all images, add @noflip where needed (may not have covered all cases)
* Pulled some things from rtl.css into main.css such that they're no-ops in LTR but are needed in RTL. Example: body { direction:ltr;
* Killed some RTL-specific rules in main.css that were superseded in main.css
* Changed padding: 0 foo; to padding-right: foo; so it gets Janused right
* Commented out loading of IE*Fixes.css. Still need to incorporate these into main.css somehow