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
[NUCLEO_F302R8] SPI master corrected
Merge pull request #315 from dbestm/master

[NUCLEO_F302R8] SPI master correction
Merge branch 'master' of https://github.com/mbedmicro/mbed