Merge pull request ARMmbed#342 from bcostm/master

[NUCLEO_F401RE] Remove call to Systick + bug fixes

Added LPC11U68 to the official build

Bumped revision number

Fix synchronization script

Updated library version

Merge pull request ARMmbed#185 from tkuyucu/master

nrf-mbed merge

Merge pull request ARMmbed#184 from oliviermartin/om/fat-sync-file-wh…

…en-writting

libraries/fs: Added logic to transparently sync written file

Fix DAC initialization#

Add Nucleo board reset. Do not release Nordic yet.

Merge pull request ARMmbed#140 from Sissors/master

KL46Z: Added Sleep, LED3 and LED4 definitions, switches