Update model parameters

[mariekers]

Update model calls to use parameters from Defaults and Parameters instead of the original global variables. The Defaults and Parameters objects are from #111 and #110

Done:

• "model.*" object that holds DataFrames output from the Models rather than passing multiple pieces of related information (ei. s, i, and r vectors).
• Feed "control.*" and "model.*" into the Charts, Have the Charts produce properties of a "view.*" object that can be unit tested. Usually a projection of a model or model(s) DataFrames. Separate Chart render from the 'view.*' for unit testing.

[quinn-dougherty]

update: model will not be a class, it will be a function signed Parameters -> DataFrame. The Parameters object is defined in #154 models.py

[jlubken]

Sounds good to me!

[quinn-dougherty]

#182