Crazyflie BL V1.1

Remove startup song. Firmware flashed in first production run of the Crazyflie BL.

Full Changelog: cf2.1bl_1.0...cf2.1bl_1.1

Crazyflie BL V1.0

First release candidate release of the Crazyflie 2.1 Brushless ESC firmware.

The firmware is pre-configured for normal and reverse rotation by default but can still be configured using the config tool.