added blob datatype in dropboxstorage getAttachment's ajax request,

to not receive corrupted files

src/jio.storage/dropboxstorage.js

@@ -213,6 +213,7 @@
       .push(function () {
         return jIO.util.ajax({
           type: "GET",
+          dataType: "blob",
           url: get_template.expand({
             root: that._root,
             id: id,

[Romain Courteaud]

This can be commited outside the gdrive functionnality