Convert HTTP API vumi worker to new-style config and add concurrency_limit option.
Basic end dialogue state
Remove go.campaign.dialogue.states.dummy.js addition from this branch (it is irrelevant to this PR, was added by mistake)
Remove unnecessary fluff from dialogue end state's tests
Merge branch 'feature/issue-433-configurable-concurrent-clients-for-http-api' into develop
Merge branch 'develop' into develop-frontend
Fix up badly named end dialogue state tests (a side effect of mindless copy pasting)
Add forgotten dummy dialogue state
Merge branch 'develop-frontend' of github.com:praekelt/vumi-go into develop-frontend
Merge branch 'develop-frontend' into feature/issue-438-end-dialogue-state
Merge branch 'develop-frontend' into feature/issue-437-freetext-dialogue-state

Conflicts:
	go/base/static/js/test/runner.html