Add download_path() method for ExportMasterView

default behavior isn't very smart, subclass should override as needed

tailbone/views/exports.py

@@ -74,6 +74,10 @@ class ExportMasterView(MasterView):
                                                    export.filename,
                                                    makedirs=makedirs)
 
+    def download_path(self, export, filename):
+        # TODO: this assumes 'filename' default!
+        return self.get_file_path(export)
+
     def configure_grid(self, g):
         super(ExportMasterView, self).configure_grid(g)