Specter Lipo skid

Lipo skids useful to protect under-mounted batteries on X frames.
Originally designed for the [Specter X frame](http://sandronefpv.com/) but it's compatible with every X frames out there (Krieger, MItsuko, Shirke and XBR)
I uploaded also a 10 degree 1300mah version that should ease lift-offs and landings!