Add frontend assets and plugin bundles

Add the legacy frontend themes, scripts, and plugin assets required by the main SPOTA interfaces.

assets/plugins/select2/bower.json

@@ -0,0 +1,8 @@
+{
+    "name": "select2",
+    "version": "3.4.3",
+    "main": ["select2.js", "select2.css", "select2.png", "select2x2.png", "select2-spinner.gif"],
+    "dependencies": {
+        "jquery": ">= 1.7.1"
+    }
+}