fixed probable cause of rare 1-wire bus deadlock where the Arduino would not release the bus and keep pulling it low forever (thanks to fari on http://www.stm32duino.com/viewtopic.php?f=9&t=1852 for posting this fix)

OneWireSlave.cpp

@@ -390,6 +390,7 @@ void OneWireSlave::endSendBitZero_()
 void OneWireSlave::beginWaitReset_()
 {
 	disableTimer_();
+	pin_.inputMode();
 	pin_.attachInterrupt(&OneWireSlave::waitReset_, CHANGE);
 	resetStart_ = (unsigned int)-1;
 }