Merge pull request #313 from dbestm/master

 [NUCLEO_F302R8] enhance SPI slave
Bumped revision number
Added LPC11U68 to the official build
Removed BLE related code to github

As part of transitioning to mbed.org, the BLE code is now only available
on mbed.org:

http://mbed.org/teams/Bluetooth-Low-Energy/code/BLE_API/
http://mbed.org/teams/Nordic-Semiconductor/code/nRF51822/
remove BLE related tests;
They were only demos; not real tests.
SD card test updated with 11U68 pinology
Added pins for EEPROM line test
Merge pull request #315 from dbestm/master

[NUCLEO_F302R8] SPI master correction
[NUCLEO_L053R8] Fix baudrate issue with LPUART1

+ add code for spi_free()
+ typo corrections
Merge pull request #318 from bcostm/master

[NUCLEO_L053R8] Fix baudrate issue with LPUART1
Merge branch 'master' of https://github.com/mbedmicro/mbed