devilry_settings: Custom testrunner that excludes non-devilry apps.
devilry_settings.testsuiterunner: Include methodname in path.
devilry_usersearch.tests: Fixed.
apps.core.deliverystore: Removed the DBM deliverystore.

Not used, and not needed for testing.
devilry_settings.default_settings: Ignore tests for student and examiner simplified API.

See #385. We ignore them because we want to be able to actively test the rest of Devilry
without having to bother with these tests. The issue ensures that we will not forget to
fix the errors.
apps.core.tests.assignment_group: Fixed timing issues.
devilry_developer.settings.base: Use MD5PasswordHasher.
apps.gradeeditors.tests.simplified.examiner: Fixed timing issue.
apps.gradeeditors.simplified.examiner: Use exists instead of expanding a list for permission check.
apps.administrator.tests.simplified: Fixed timing issue.
apps.extjshelpers.tests: Fixed modelintegration test (updated for changes in des 2012).