Handle malformed responses

When userGrid is down or returns something unexpected this response handler throws an exception because it tries to access properties of undefined.
Revert "Handle malformed responses"

This reverts commit 4bfe4e0b559dbc397dc9c5758a6cd6cbf0b09c5c.
Handle malformed responses - When userGrid is down or returns something unexpected this response handler throws an exception because it tries to access properties of undefined.
Merge pull request #134 from richardscarrott/master

NodeJS SDK - Handle malformed responses