Override ActionDispatch::Http::Headers#env_name to allow storage of Shibboleth environment variables in our integration tests. The default  prepends a 'HTTP_' to all environment vars passed in because it thinks they're HTTP Headers.
Add "request" integration tests to login in via NYU shibboleth.
Configure the Shibboleth OmniAuth strategy to map the desired NYU attributes to the
Merge branch 'create_user_from_nyu_shibboleth'