Rest UI Extention

Summary
This module is an extension to the REST UI module.
It modifies the web service responses with addition of Error codes and descriptions.
It also facilitates REST Web service request & response formatting. With this it is modifying the json/xml object with removal of parameter 'value' and 'target_id'.
So the modified request & responses will be assigning values directly to the particular field.

e.g.
with this the webservice response will be,
{
"name": "test",
"mail": "test@example.com",
"status": "200",
"message": "Success"
}

instead of
{
"name": [
{
"value": "test"
}
],
"mail": [
{
"value": "test@example.com"
}
]
}