Added a configuration option for using u32 in the uip_ip4addr_t structure: UIP_CONF_UIP_IP4ADDR_T_WITH_U32
Added a configuration option for using u32 in the uip_ip4addr_t structure: UIP_CONF_UIP_IP4ADDR_T_WITH_U32

arurke/contiki,arurke/contiki,arurke/contiki,arurke/contiki,bluerover/6lbr,arurke/contiki,arurke/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki,bluerover/6lbr,arurke/contiki,bluerover/6lbr,MohamedSeliem/contiki,bluerover/6lbr,bluerover/6lbr,bluerover/6lbr,bluerover/6lbr,MohamedSeliem/contiki,MohamedSeliem/contiki