target K20D5M

Hello,

this is the very first support for Cortex M4 from Freescale - K20D5M target. The implementation is not complete, some of peripherals are not yet functional.  I will continue with testing.

It includes GCC ARM, ARM support , exporters are available for both compilers. 

CMSIS-DAP interface is shared on my mbed notepad. Any help to complete this port is appreciated.

Regards,
0xc0170