Quadcopter Sonar Mount

A remix of [jag's Sonar mount for Arducopter](http://www.thingiverse.com/thing:11973) to produce a mount suitable for the 2014 [3DR DIY Quad Kit](https://store.3drobotics.com/products/diy-quad-kit) and the [MaxBotix MB1240](http://www.maxbotix.com/Ultrasonic_Sensors/MB1240.htm).