YamQ (Yet Another Micro Quad): Brushed Micro Quad for Autoquad M4

Since we do not have enough micro quadcopter frames on Thingiverse, I decided that it is up to myself to design: Yet Another Micro Quad (YamQ). The frame is inspired by the design from [alpinedrones](http://www.thingiverse.com/thing:717375) and specifically tailored to work together with an [Autoquad M4](http://autoquad.org/wiki/wiki/m4-microcontroller/). I went through several iterations optimizing the weight as much as possible while keeping the frame rigid to withstand smaller collisions. The