MISC/COSMITS: addresses minor doc and viz style issues

- fix doc string for equalize epochs count method
- red instead of black hline for evoked plots (now that the default to black
black hlines are not easy to discern.). I prefer this to adding another compicated dict as param.
Looks like this:

![whitened_lower-prestim-baseline_room](https://f.cloud.github.com/assets/1908618/186061/ea0be7a4-7d1c-11e2-8b41-56c597291386.png)