FIX: Fix docs

Closes #428.

Docs look good to me. Ready for review/merge. Can be viewed by doing:
```Bash
$ python make doc html && python make doc show
```

Line 72 has `super(BaseCamera, self).__init__(**kwargs)`.

For now I think I'll make a copy of all the arguments since that's most useful to the user. @almarklein in the long term I agree that we shouldn't have to do this (DRY), but that will have to wait until we hack together automatic parent-docstring additions. (Might end up being more effort than it's worth.)