add .travis.yml file
get the tests into a runnable state
Move logic for translating a request env to a devise user name into DeviseRemoteUser.remote_user_id
allow config.env_key to be a Proc that gets the request env and returns the key
Merge pull request #3 from sul-dlss/env-key-proc

Allow config.env_key to be a Proc, to allow dynamic user id creation