Model Management View: Listing all the models in the system and for your user

[lauralorenz]

To increase the value of partisan-discourse as a tool to demonstrate a model management system and as a system to learn more about ML, we want to incorporate a model display view in the UI that showcases to a user the currently stored models, particularly as a breakdown between the global models and a user's models.

This issue is closed when a user can login, navigate to a model display page, and there see a listing of their user's models (and their respective scoring data) and the global (aka null user) models and their respective scoring data. The page design is pretty open ended but for whomever takes this issue we can brainstorm on it a bit together as needed.