Improve dataTables integration within the app:

- Manage lib through NPM
- Move portal / Bootstrap files back to the itop-portal-base module (not managed through NPM yet)
- Fix SCSS classes for the backoffice as it was based on the bootstrap CSS classes which are not there anymore

Note: jQuery is included as a dependency, will check with the team if we can force it not to be retrieved

node_modules/jquery/src/var/push.js

@@ -0,0 +1,7 @@
+define( [
+	"./arr"
+], function( arr ) {
+	"use strict";
+
+	return arr.push;
+} );