Clean up Readme a bit.
Removes active_model_serializers gem and unused JSON serialization code that is unused.
Adds a feature test for user logout
Attempt to fix CI via modified travis.yml
Merge pull request #84 from dhawt/master

Quick readme cleanup.
Changes database cleaner strategy to :truncation instead of :deletion in attempt to fix Travis. (:transaction causes integration tests to fail)
Merge pull request #81 from dhawt/test_cleanup

Test cleanup