Introduced a mechanism to load required javascripts at runtime

(lazy loading) using the require.js. This allows us to load the
javascript required for any node, only when it was loaded in the browser
tree. Also, introduced the mechanism to show/edit/create of any node in
a tab panel (wcDocker.Panel).

web/pgadmin/utils/ajax.py

@@ -9,13 +9,25 @@
 
 """Utility functions for dealing with AJAX."""
 
-from flask import jsonify
+from flask import Response
 import json
 
-def make_json_response(success=True, **kwargs):
+def make_json_response(success=1, errormsg='', info='', result=None, data=None, status=200):
     """Create a HTML response document describing the results of a request and
     containing the data."""
-    response = kwargs.copy()
-    response.setdefault('result', {})
-    response.setdefault('data', {})
-    return jsonify(response)
+    doc = dict()
+    doc['success'] = success
+    doc['errormsg'] = errormsg
+    doc['info'] = info
+    doc['result'] = result
+    doc['data'] = data
+
+    return Response(response=json.dumps(doc),
+                        status=status,
+                        mimetype="text/json")
+
+def make_response(response=None, status=200):
+    """Create a JSON response handled by the backbone models."""
+    return Response(response=json.dumps(response),
+                        status=status,
+                        mimetype="text/json")