Release v0.4.5.2

Small non-signficant updates see history.md for details.

v0.4.5.1 Release

Minor change for startup settle delay with slow flashing LED (approx 1sec flash during this delay)

v0.4.5 Release

Added delay to startup to allow gimbal to settle

v0.4.4 Release

added gpl license, updated rc for futaba, added defined IMU address see history for other changes..

v0.4.3 Release

includes the usb bootloader, IMU configuration changes, and other changes see history.md for specifics

v0.4.2.1 Release

non-critical update for an internal version string