Update Travis config
Update Travis config

- Add license header
- Clone CouchDB faster
- Test against Erlang 18.1 and 18.2
- Drop R14B04 support
- Use new better way to run specific app tests
- Use containers

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb