Fluorescent / Mbed 2 deprecated mcr20_wireless_router

Working Thread (the wireless kind) example with DHCP Ethernet enabled. At this point, router is not a correct description. I do not know if Thread will handle routing automatically or I will need to do something to enable internet connectivity to a Thread client device. That is the goal, give a Thread client a routable connection to the internet.

Dependencies:   EthernetInterface fsl_phy_mcr20a fsl_smac mbed-rtos mbed