Added edu.uwb.braingrid.provenance.workbenchprov package and WorkbenchOperationRecorder class. Moved script upload operation to the new class.

This commit provides specific provenance for upload operations and allows for workbench domain specific provenance to be recorded from a single class. All current provenance recording should be moved to the WorkbenchOperationRecorder class. Thereafter, all future provenance relevant workbench operations should be performed through the use of this class.