Pretrained models, better tracking for Proxima

[WardLT]

Fixes #31 and fixes #35

To do:

• [x] Make it so Proxima will not use untrained models. If we start with pretrained models, the variance is zero before training and this gives unrealistic expectations of accuracy.

[coveralls]

Pull Request Test Coverage Report for Build 10144294004

Details

• 18 of 18 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 94.845%

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Totals
Change from base Build 10112937306:	0.1%
Covered Lines:	644
Relevant Lines:	679

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💛 - Coveralls