Add OAuth apps and OAuth response_mode

[codecov[bot]]

Codecov Report

Merging #263 into dev will increase coverage by 1.12%. The diff coverage is 84.26%.

@@            Coverage Diff             @@
##              dev     #263      +/-   ##
==========================================
+ Coverage   74.76%   75.89%   +1.12%     
==========================================
  Files          46       51       +5     
  Lines        2009     2157     +148     
==========================================
+ Hits         1502     1637     +135     
- Misses        507      520      +13

Impacted Files	Coverage Δ
abe/resource_models/event_resources.py	65.62% <ø> (-0.53%)	:arrow_down:
abe/database.py	90% <100%> (+0.52%)	:arrow_up:
abe/resource_models/label_resources.py	83.33% <100%> (-1.75%)	:arrow_down:
abe/document_models/app_documents.py	100% <100%> (ø)
tests/test_admin.py	100% <100%> (ø)
tests/test_oauth_flow.py	100% <100%> (ø)	:arrow_up:
tests/test_user.py	100% <100%> (ø)
abe/app.py	93.61% <100%> (+22.6%)	:arrow_up:
tests/__init__.py	100% <100%> (ø)	:arrow_up:
tests/context.py	100% <100%> (ø)	:arrow_up:
... and 13 more

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