Refactoring the data model

[dwhenry]

Move from the current data model:

to the proposed data model:

Some of the changes are captured elsewhere (i.e. adding the concept of competition), and should be treated as a separate task.

The primary goal of this task is to:

• Add the side object to simplify team filtering, etc..
• Remove the result object, this data should be stored on the side.
• Have picks be aware of the picked team and score - current negative for away side - and store the points awarded once the results are know to avoid recalculating
• Rename league_member to player