Modified 52n WPS method so that a user defined filename can be passed into the retrieval method
Added optional filename into dialog for submitting processing.  Filename is passed through into the WPS method when retrieving output so that the user defined filename is used instead of the long id.
Altered the successful process email to include the alternative filename if user included it.
URLEncoded filename requested
Merge pull request #69 from prusso-sse/master

Use descriptors in filename