interface (android.os.DropBox); move the Binder interface
behind the scenes. Make DropBoxEntry into DropBox.Entry.
Make it possible to get a dropbox from an (Application)Context
with the usual getSystemService(DROPBOX_SERVICE) type thing.
Update the tests accordingly.
queue of data chunks (sort of a blob-oriented logcat).
In the future, this will be coupled with a revised checkin service that
would actually upload this data.