feature/button-text-color

This PR changes the button/text colors to be more readable.

From this:
![screen shot 2014-09-30 at 2 54 34 pm](https://cloud.githubusercontent.com/assets/1165361/4464388/45a3a4d4-48d3-11e4-877c-0849e525baa0.png)

To this:
![screen shot 2014-09-30 at 2 54 16 pm](https://cloud.githubusercontent.com/assets/1165361/4464391/493716bc-48d3-11e4-99a0-097175642249.png)

@jazahn Review?

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[FLASH-167](https://jira.huit.harvard.edu/browse/FLASH-167)