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/datatables.net-responsive/package.json

@@ -0,0 +1,31 @@
+{
+    "name": "datatables.net-responsive",
+    "version": "2.1.0",
+    "description": "Responsive for DataTables ",
+    "files": [
+        "js/dataTables.responsive.js"
+    ],
+    "main": "./js/dataTables.responsive.js",
+    "keywords": [
+        "responsive",
+        "DataTables",
+        "jQuery",
+        "table",
+        "DataTables"
+    ],
+    "homepage": "https://datatables.net",
+    "bugs": "https://datatables.net/forums",
+    "license": "MIT",
+    "author": {
+        "name": "SpryMedia Ltd",
+        "url": "http://datatables.net"
+    },
+    "dependencies": {
+        "jquery": ">=1.7",
+        "datatables.net": ">=1.10.9"
+    },
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/DataTables/Dist-DataTables-Responsive.git"
+    }
+}