code: public List<WnsNotificationResponse> pushRaw(List<String> channelUris, WnsRaw raw) throws WnsException {
  		return this.pushRaw(channelUris, null, raw);
  	}
docs: Pushes a raw message to channelUris
  @param channelUris
  @param raw which should be built with {@link ar.com.fernandospr.wns.model.builders.WnsRawBuilder}
  @return list of WnsNotificationResponse for each channelUri, please see response headers from <a href="http://msdn.microsoft.com/en-us/library/windows/apps/hh465435.aspx#send_notification_response">http://msdn.microsoft.com/en-us/library/windows/apps/hh465435.aspx#send_notification_response</a>
  @throws WnsException when authentication fails