Oneshot complete NAZE and CC3D (from PR#193)

The only purpose of this PR is to facilitate final merging.
I included all the improvements and last modifications by nebbian and ledvinap made in PR#193 (even the Oneshot.md file).
I compiled and tested the Naze.hex and CC3D.hex  files. Everything (PPM, oneshot, telemetry and UART) work fine on the bench for both boards.