Doc timeseries

Started out with fixing spaces in docs, and writing some docs that were missing, and ended up with a bug-fix to boot. We need to figure out what we wanted from the Events and Epochs, because honestly, I don't know what they're for...

Also: I am giving a small workshop on nitime next week and prepared some materials for that, which are here: 

https://github.com/arokem/teaching_nitime

If anyone has any feedback, please do let me know.