Allow addRequestData to be overridden
Allow addRequestData to be overridden

To allow request data to be added from non-express servers

loyaltylion/node_rollbar,loyaltylion/node_rollbar,colonyamerican/node_rollbar,rollbar/node_rollbar,bjyoungblood/node_rollbar,colonyamerican/node_rollbar,rollbar/node_rollbar,sloops77/node_rollbar,sloops77/node_rollbar,Crisfole/node_rollbar,blahed/node_rollbar,blahed/node_rollbar,Crisfole/node_rollbar,bjyoungblood/node_rollbar