In swift_download_config: FakeSessionSwiftDownloadImpl extends
SwiftDownloadImpl and circumvents certain, hopefully unnecessary,
things. FakeSession simply implements the sole function needed in
SwiftDownloadImpl.__init__ .
payload file has small changes for the better. community now sends and
receives FileHashMessages. conversion properly converts the contents of
the messages. endpoint calls swift to start_download. get_roothash still
needs to be implemented.
register in dispersy_instance distinquishes different kind of messages.
minor changes in filepusher