add nrf51822 target and hex file support
Merge to support nRF51822 and hex file
support hex file generated by gcc toolchain
Add support STM32f051k4/R8 chips and share flash algorithm with STM32f103rc.
Merge branch 'master' of https://github.com/xiongyihui/CMSIS-DAP
Merge branch 'master' of https://github.com/wjzhang/CMSIS-DAP

Conflicts:
	interface/Common/src/swd_host.c
	interface/Common/src/usbd_user_msc.c
Merge remote-tracking branch 'wenjin/STM32'