I’m going to add some info on the nRF8001 here when I get a chance. For now you can access some Arduino files that are hard to find below.
http://matthack.com/wp-content/uploads/2013/12/0_5_0_RC3_no_wires2.zip
http://matthack.com/wp-content/uploads/2013/12/Bluetooth_low_energy_for_Arduino_0_5_0_0_RC2.zip