Removed UICR edit.
nordic_global.h file now included
Merge remote-tracking branch 'upstream/master'
Updated Sleep

using WFE for nordic sleep
Removed systemoff call from deepleep since it does not retain program
state.
Updated copyright headers

commented out unused variable in cmsis_nvic.c
Merge remote-tracking branch 'upstream/master'
Writing FWID to UICR in SystemInit
Added checks on compilation flags.
Merge remote-tracking branch 'upstream/master'
SoftDevice added.
Merge remote-tracking branch 'upstream/master'
Merge pull request #185 from tkuyucu/master

nrf-mbed merge