Updated suite for test_File to include ContainerFile tests.
Updated suite for test_File to include ContainerFile tests.

Can't forget to add new classes to the suite.

datreant/datreant,andreabedini/datreant,datreant/datreant.data,datreant/datreant.core,datreant/datreant.core,dotsdl/datreant,datreant/datreant