Include inline dialogue state add button in dialogue screen grid
Merge branch 'feature/issue-487-dialogue-screen-tests-should-use-the-screens-css' into feature/issue-468-inline-add-dialogue-state-button

Conflicts:
	go/base/static/css/conversations.less
	go/base/static/css/vumigo.css
	go/base/static/js/src/campaign/dialogue/states/states.js
Add event handling for the dialogue screen's grid's '.add' button
Use <button> for dialogue grid's '.add' button
Remove forgotten debug line
Merge branch 'develop-frontend' into feature/issue-468-inline-add-dialogue-state-button
Removed unecessary @state-width less variable
Add a comment for why we need to change the dialogue state add button's index back to infinity each reorder
Merge branch 'develop-frontend' into feature/issue-468-inline-add-dialogue-state-button
Reword badly worded comment
Merge branch 'develop-frontend' of github.com:praekelt/vumi-go into develop-frontend