updated health text position and used reversed gradiant

EDIT: Apparently I'm so confused today I issued a pull for the master branch -_-'
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Do we want this? (Probably yes to the healthtext, but what about the reversed gradiant? like it? )


![esper classres_explain](https://cloud.githubusercontent.com/assets/7889925/3342323/3655bafe-f891-11e3-85af-f04e6d0716bf.png)