Add a comment about the server not complaining about bad authentication.
SyncAdaptr.doUploadSync(): Add "interface" param to mark it as from the app.

Add:
interface: murrayc.com-android-galaxyzoo
to the parameters in the content of the POST to make it easier for
the server to identify the app as the source of the classifications.
See https://github.com/murraycu/android-galaxyzoo/issues/11