Adding the following files for homework 5:
main12_7.cpp / Ex12_7.bin / Ex12_7.elf = Mbed board #1 generates and sends 2 bytes in an ethernet packet.
main12_8.cpp / Ex12_8.bin / Ex12_8.elf = Receives packets from mbed board #1 and forwards on to terminal console window.

-Drew Plant Nov. 11, 2014
These files didn't make it into previous commit.
Drew Plant - Nov 11, 2014