Prettier titlebar for dialogue state (and correspond endpoint colour change for consistency)
Slightly lighter dialogue state titlebars
Use a variable for dialogue state padding
Merge branch 'develop-frontend' into feature/issue-455-prettier-titlebars-for-dialogue-states

Conflicts:
	go/base/static/css/conversations.less
	go/base/static/css/vumigo.css
Merge branch 'develop-frontend' into feature/issue-455-prettier-titlebars-for-dialogue-states