Trying to implement the response object for signup call
Cleaning up code to handle response uniformly

*Adding response object for every call.
*Adding MIME type for response
*Using ResponseWrapper object in every call to pass Error & Data values
*Setting reponse data from responseWrapper object
*Removing all redundant code
*Adding Try blocks for reading form data
Adding hash to group object for the method "get_groups"
Fixing minor errors after one complete round of test