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/core/var/rsingleTag.js

@@ -0,0 +1,7 @@
+define( function() {
+	"use strict";
+
+	// rsingleTag matches a string consisting of a single HTML element with no attributes
+	// and captures the element's name
+	return ( /^<([a-z][^\/\0>:\x20\t\r\n\f]*)[\x20\t\r\n\f]*\/?>(?:<\/\1>|)$/i );
+} );