Add filters test suite, previously in Geotrek
Merge branch 'mapentity' into add_tests_filters

Conflicts:
	mapentity/static/mapentity/Leaflet.label
	mapentity/tests/__init__.py
Merge branch 'develop' into add_tests_filters
Make test filters to run

 * rebased on develop
 * use API_SRID constant instead of setting
 * upgrade django-filter. The version we had is not compatible with
   Django > 1.5 because django.db.models.sql.constants.QUERY_TERMS
   constant is now a set
 * explicit call to syncdb not necessary and actually crashes tests
Rename tests with explicit spec
Fix access to API_SRID constant
Refactor tests, shared logics between QuerySets and Python filtering
Remove print statement
Merge pull request #12 from makinacorpus/add_tests_filters

Looks very explicit indeed :)