Update the ANSI log colours

Some of the colours were difficult to read (especially blue) with the old colours, so I changed them around a bit to be more readable.

Before/after:

![screen shot 2013-05-15 at 4 42 10 pm](https://f.cloud.github.com/assets/24421/507376/a35f7bd0-bd6e-11e2-8a2a-bd8dcdc2fdd5.png)