Had to enable LPF to get rid of jitter

Since the Nanoquad is one solid frame and the flight controller is
directly soldered onto it, there is no good way of dampening vibrations
physically (unless you'd shell out 50 bucks for each motor to get high
quality ones with low vibrations), so I had to enable the LPF at 98Hz to
improve the situation.
Adjusted idle throttle for BLHeli firmware

My ESCs now use the BLHeli firmware for multicopters. I had to adjust the
idle speed a little to the new firmware.