Add SpeciesManager for filtering by both common_name and scientific_name
Add filtering and max_items to species endpoint, tests
Modify SpeciesManager.conatins_name to first do a multi-tiered search

First contains_name will attempt to search based on the exact text entered,
then if that returns no results it will do a more complex search by
breaking the query string into words and searching for each individual word
in the various name fields.
Merge branch 'topic/speciesAutocomplete' of github.com:maurizi/OTM2 into maurizi-topic/speciesAutocomplete

Conflicts:
	opentreemap/treemap/tests.py