Externalized SDK directive templates.
Merge branch 'master' of github.com:onehippo/essentials

Conflicts:
	plugin-dashboard/src/main/webapp/js/app.js
Merge branch 'master' of github.com:onehippo/essentials

Conflicts:
	plugin-dashboard/src/main/webapp/js/app.js
Merge branch 'master' of github.com:onehippo/essentials