The JSME tool ships with css stylesheets that point to images that don't
ship with the JSME tool.  This messes up Django's collectstatic script,
so we're just removing the offending rules from JSME's css.

Make room for FG dropdown.  Unfortunate side effect is a lot of empty space below the tool.  No real good fix for that.

Don't explicitly depend on XModule--bootstrapping dependencies in the platform build in the right order seems to be tricky.