[front-end] start switching to boostrap
Merge branch 'bootstrap' into sceditor

Conflicts:
	src/main/webapp/WEB-INF/index.html
	src/main/webapp/WEB-INF/js/app.js
	src/main/webapp/WEB-INF/js/main.js
	src/main/webapp/bower.json
	src/main/webapp/test/unit/test-main.js
[front-end] more bootstrap, less foundation
Merge branch 'bootstrap' into sceditor
[front-end] set body max-width
Merge branch 'bootstrap' into sceditor