Add store object to store data
Add testing store
A few English errors

I guess the store docs are still WIP, so I'll leave them for the most part
NotImplemented ==> NotImplementedError

>>> raise NotImplemented()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'NotImplementedType' object is not callable
Add unit test for store class
Fix problem with JSONStore not saving to disk
Remove Kr theme and add fix tutorial for store