[front-end] add sceditor, buggy because of Foundation compat. problems
Merge branch 'develop' into skeditor

Conflicts:
	src/main/webapp/WEB-INF/js/app.js
	src/main/webapp/bower.json
[unit-test] fix typo in requirejs config
[maven] mvn clean removes node_modules now; gulp clean is not invoked
[npm] update versions of npm dependencies
[front-end] fix sceditor's editor
Merge branch 'sceditor' into develop