403 (Forbidden) errors from GREAT API

[wes-brooks]

Attempting to run the enrichModule function, we get 403 errors in response from the GREAT API. I think this is because all the data requests are sent at once, which the GREAT webservice interprets as an attack. To fix this, there should be the option of increasing the request_interval parameter of the submitGreatJob function from the rGREAT package.