Removes hardcoded MIT from fruitsalad/index.html
More fixes to hardcoded fruitsalad styles

Replaces some hardcoded yellowgreen fruitsalad colors with the
appropriate LESS variables. This fixes the index.html login box, which
was always yellowgreen.

Removes corners_6_gw.png, which was always yellowgreen. Instead uses the
border-radius CSS attribute.
Merge pull request #923 from learning-unlimited/hardcoded-mit

Fixes to hardcoded fruitsalad templates and styles