CQL and filters are one or the other
get CSW tests working
update deps in requirements.txt, move from .travis.yml
update tests
update test
move doctest
WMTS test fix - make testing more robust by sorting list
Remove ERDAS tests that fail (because of incorrect bounding box coordinate order).

It would have been nice to update with newer implementation, but the test servers
are no longer available, so this seems the best way.
Merge pull request #91 from bradh/wmtscleanup

WMTS test cleanup