Turns off highlighting of today for cal command

This fix turns off highlighting of today for `cal` command.

**Before fix**:
![2014-10-23-233709_1920x1080_scrot](https://cloud.githubusercontent.com/assets/1256298/4761077/2b76b946-5af5-11e4-9dfb-f0cbf2b2bce8.png)


**After fix**:
![2014-10-23-233841_1920x1080_scrot](https://cloud.githubusercontent.com/assets/1256298/4761081/364b8eb4-5af5-11e4-951f-6743dbdf620b.png)