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/bower.json

@@ -0,0 +1,14 @@
+{
+  "name": "jquery",
+  "main": "dist/jquery.js",
+  "license": "MIT",
+  "ignore": [
+    "package.json"
+  ],
+  "keywords": [
+    "jquery",
+    "javascript",
+    "browser",
+    "library"
+  ]
+}