Fixed problem with Java apps having white text on white menus

Fixes issue #62.
As an unintended side effect, disabled menu items no longer have the light shadow/blur, _except_ in Java apps, where it's extra intense.

Netbeans:
![Netbeans with readable menus](https://cloud.githubusercontent.com/assets/4693844/3633912/d927b758-0f04-11e4-8db3-ac0285e4fbe8.png)

GIMP, showing how this change makes disabled menu items look:
![GIMP with some disabled menu items](https://cloud.githubusercontent.com/assets/4693844/3633911/d8d5f666-0f04-11e4-8019-52f3e80f59b1.png)