Cleanup.
Update flash_nrf51822.py:
- change default offset to 0x16000
- add erase flash option
- add skip option (offset for binary file)
- use soft reset
Added 9009 board id for nrf51822 target. Fix dev.open call for different version of hidapi. Return all available boards from hidapi interface.
Select board by board_id. List availbale boards.