Merge branch 'feature/issue-457-endpoints-and-connectors' into feature/issue-471-remove-deprecated-support-for-low-level-application-and-transport-underscore-method-hacking
Remove deprecated methods.
Fix uses of deprecated pause / unpause methods in SMPP.
Fix uses of deprecated pause / unpause methods in XMPP.
Merge branch 'feature/issue-457-endpoints-and-connectors' into feature/issue-471-remove-deprecated-support-for-low-level-application-and-transport-underscore-method-hacking
Merge branch 'feature/issue-457-endpoints-and-connectors' into feature/issue-471-remove-deprecated-support-for-low-level-application-and-transport-underscore-method-hacking

Conflicts:
	vumi/application/base.py
Merge branch 'develop' into feature/issue-471-remove-deprecated-support-for-low-level-application-and-transport-underscore-method-hacking

Conflicts:
	vumi/application/base.py
	vumi/application/tests/test_base.py
Remove SEND_TO_TAGS and update documentation.
Remove default settings for config.send_to in application test utils (default settings for send_to are no longer required).
Upgrade tests for deprecate workers to a send of tests for workers that have config.send_to set.
Remove deprecated SEND_TO_TAGS attribute.
Rename tag option to OutboundResource.send_to to endpoint.
Merge branch 'feature/issue-471-remove-deprecated-support-for-low-level-application-and-transport-underscore-method-hacking' into develop