Merge pull request #276 from AvadootNachankar/mongokit

Bug resolved: Renamed attribute_value to attribute_type in GAttribute class
Commented redundant calling of jquery.js in <head>
using StreamingHttpResponse to send graph json data
Modified code to overcome Ctrl+Click issue in webkit Browser like Chrome
Merge pull request #277 from kedar2a/mongokit

 Modified code to overcome Ctrl+Click issue in web-kit Browser like Chrome.
Bug fixed regarding group name in user dashboard
Merge pull request #279 from sunnychaudhari/mongokit

Bug fixed regarding group name in user dashboard
Bug fixed regarding heterogeneous collection drawer
Merge pull request #280 from sunnychaudhari/mongokit

Bug fixed regarding heterogeneous collection drawer
Merged commit #280 and get_possible_attributes() added [only while creating GSystems]