Implement some OpenID

[codecov[bot]]

Codecov Report

Merging #275 into master will increase coverage by 2.78%. The diff coverage is 79.06%.

@@            Coverage Diff             @@
##           master     #275      +/-   ##
==========================================
+ Coverage   77.03%   79.81%   +2.78%     
==========================================
  Files          52       52              
  Lines        2229     2304      +75     
==========================================
+ Hits         1717     1839     +122     
+ Misses        512      465      -47

Impacted Files	Coverage Δ
abe/resource_models/subscription_resources.py	91.54% <0%> (+50.7%)	:arrow_up:
abe/resource_models/event_resources.py	73.43% <100%> (+8.08%)	:arrow_up:
abe/routes/admin_routes.py	71.79% <100%> (+2.35%)	:arrow_up:
tests/test_ics_helpers.py	100% <100%> (+19.56%)	:arrow_up:
tests/test_event_resource.py	100% <100%> (ø)
abe/resource_models/app_resources.py	88.88% <100%> (+1.85%)	:arrow_up:
abe/helper_functions/url_helpers.py	100% <100%> (ø)	:arrow_up:
tests/test_app_resource.py	100% <100%> (ø)
tests/test_url_helpers.py	100% <100%> (ø)	:arrow_up:
tests/test_subscription_resources.py	100% <100%> (+35.71%)	:arrow_up:
... and 10 more

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