clean up board, move helper to end of the file for easy code reading
working on generic service/characteristic
make btle_advertising.c to support generic service/characteristic
moving service & characteristic to main.c
add btle_gap_get_connection
implement btle_characteristic_update
Merge branch 'master' of github.com:microbuilder/IntroToBLE

Conflicts:
	nRF51822/projects/uartservice/btle.c
	nRF51822/projects/uartservice/main.c