[DMU] Refactor + clear code. Update clipping to get a better range to display and share it in co-browsing mode.
Merge branch 'dev' of github.com:docdoku/docdoku-plm into dev

Conflicts:
	docdoku-server/docdoku-server-web/src/main/java/com/docdoku/server/mainchannel/collaborative/CollaborativeRoomController.java
	docdoku-server/docdoku-server-web/src/main/webapp/js/product-structure/app.js
	docdoku-server/docdoku-server-web/src/main/webapp/js/product-structure/frameApp.js
	docdoku-server/docdoku-server-web/src/main/webapp/js/product-structure/views/parts_tree_view.js
	docdoku-server/docdoku-server-web/src/main/webapp/js/websocket/websocket.js
	docdoku-server/docdoku-server-web/src/main/webapp/product-structure/frame.xhtml
	docdoku-server/docdoku-server-web/src/main/webapp/product-structure/index.xhtml