google-http-java-client v.1.15.0: implemented default BackOffRequired, HttpIOExceptionHandler and BackOff - HttpConnectionManager initializes request using the new classes
NetworkConstants: removed deprecated constant DefaultBackOffPolicy (and deleted class) - Using DefaultBackOffUnsuccessfulResponseHandler
DefaultResponseHandlerFactory created to use default response handlers - ByteArrayDownloader moved to more appropriate .lib.network package
HttpConnectionManager: using single HttpUnsuccessfulResponseHandler by default to avoid excessive GC when making many requests (it can be replaced if the client needs a more complicated back off policy)