Retrieve models from model storage

[kvikshaug]

• Locally stored models are removed
• Simulation requests now supply a model id corresponding to an id in our model storage service
• Retrieved models are cached and kept in memory for the lifetime of the service
• Public models are preloaded on service init (in prod/staging deployments, not development)
• Endpoints to get model json or its medium are removed, use the model storage service instead
• Two model files are still kept under tests/data for use during testing
• src/tools/update_models.py should probably be moved to the model storage service

Note: The travis build seems to fail because the base docker image (biosustain/cameo-solvers) is gone, but apart from that QA succeeds locally.

[codecov-io]

Codecov Report

Merging #111 into caffeine will decrease coverage by 0.14%. The diff coverage is 77.14%.

@@             Coverage Diff              @@
##           caffeine     #111      +/-   ##
============================================
- Coverage      77.2%   77.06%   -0.15%     
============================================
  Files            19       19              
  Lines           623      606      -17     
============================================
- Hits            481      467      -14     
+ Misses          142      139       -3

Impacted Files	Coverage Δ
src/model/settings.py	100% <100%> (ø)	:arrow_up:
src/model/adapter.py	64.78% <66.66%> (-0.25%)	:arrow_down:
src/model/driven.py	93.54% <66.66%> (-0.11%)	:arrow_down:
src/model/app.py	89.28% <75%> (-3.82%)	:arrow_down:
src/model/storage.py	81.25% <77.77%> (-14.91%)	:arrow_down:
src/model/resources.py	69.69% <78.12%> (+2.19%)	:arrow_up:

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[kvikshaug]

@Midnighter thanks for the comments, I've added the missing docstrings and followed up on some of the nice-to-haves. The latest rebase should fix the Travis build for the new base image. Is this g2g?