Make "today" and selected days actually visible.

selected days were white as the background. "today"'s grey was also too bright. 

before:
![2013-05-24 23 25 57](https://f.cloud.github.com/assets/1377701/563708/3204bc50-c504-11e2-8d93-fadd89144890.png)

after:
![2013-05-24 23 29 58](https://f.cloud.github.com/assets/1377701/563713/901a4a08-c504-11e2-97a2-595a2386f28f.png)