QAV250 Angled Mobius mount - Remixed

Remixed from the original: http://www.thingiverse.com/thing:471527

Changes include a triangle cutout in the middle to allow for easier securing with Velcro strap, and a slightly thicker flange.

4/15/15: New version added with an even thicker 3.5mm flange (up from 2.5mm).