[issues/#45+#49] Split HandleUp router's method
[issues/#45+#49] Split HandleUp router's method

LoRaWanSoFa/ttn,mgranberry/ttn,TheThingsNetwork/ttn,mgranberry/ttn,jvanmalder/ttn,mgranberry/ttn,TheThingsNetwork/ttn,jvanmalder/ttn,TheThingsNetwork/ttn,LoRaWanSoFa/ttn,jvanmalder/ttn