(WIP) Add documentation

[Moyoxkit]

Adds documentation. To do list:

• Basic example (DONE)
• Installation guide
• Performance options (Think cross-checks and other neat things) (DONE)
• GP options (mean models etc) (DONE)
• io with SWIFT (Done)
• Penalty functions/compare with data

Also includes a small fix to one of the examples.

[Moyoxkit]

Why does black always fail on me even if I don't even touch the files >.<