Implement OpenBadge Generation upon Certificate generation through Badgr API

.gitignore

common/lib/xmodule/xmodule/course_module.py

common/test/acceptance/pages/studio/settings_advanced.py

common/test/data/badges/good.png

common/test/data/badges/large.png

common/test/data/badges/unbalanced.png

lms/djangoapps/certificates/admin.py

lms/djangoapps/certificates/badge_handler.py

...oapps/certificates/management/commands/regenerate_user.py

...ssertion__add_unique_badgeassertion_course_id_user__ad.py

lms/djangoapps/certificates/migrations/0022_default_modes.py

lms/djangoapps/certificates/models.py

lms/djangoapps/certificates/tests/factories.py

lms/djangoapps/certificates/tests/test_badge_handler.py

lms/djangoapps/certificates/tests/test_cert_management.py

lms/djangoapps/certificates/tests/test_models.py

lms/djangoapps/certificates/tests/tests.py

lms/envs/aws.py

lms/envs/common.py

lms/static/images/default-badges/honor.png