Merge remote-tracking branch 'remotes/origin/feat-mongoengine-connection-field-filters' into feat-mongoengine-connection-field-filters

# Conflicts:
#	graphene_mongo/fields.py
#	graphene_mongo/tests/models.py
#	graphene_mongo/tests/test_relay_query.py

Author: Arun S Kumar

graphene_mongo/fields.py

@@ -8,7 +8,7 @@
 from graphene.relay import ConnectionField
 from graphene.types.argument import to_arguments
 from graphene.types.dynamic import Dynamic
-from graphene.types.structures import Structure
+from graphene.types.structures import Structure, List
 from graphql_relay.connection.arrayconnection import connection_from_list_slice
 
 from .advanced_types import (
@@ -81,10 +81,11 @@ def is_filterable(k):
                 converted = convert_mongoengine_field(getattr(self.model, k), self.registry)
             except MongoEngineConversionError:
                 return False
-            if isinstance(converted, (ConnectionField, Dynamic)):
+            if isinstance(converted, (ConnectionField, Dynamic, List)):
                 return False
             if callable(getattr(converted, 'type', None)) and \
-                    isinstance(converted.type(), (FileFieldType, PointFieldType, MultiPolygonFieldType, graphene.Union)):
+                    isinstance(converted.type(),
+                               (FileFieldType, PointFieldType, MultiPolygonFieldType, graphene.Union)):
                 return False
             return True