keep EstN from diverging to zero
Merge pull request #80 from luggi/EstNfix

keep EstN from diverging to zero
type bool and inflight acc calib
Update sensors.c
format
Update imu.c

speed up troll angle
Merge pull request #81 from treymarc/type_bool

type bool and inflight acc calib
Merge pull request #83 from treymarc/format2

format
Merge pull request #84 from treymarc/patch-1

Update imu.c
Updating accgyro files so they do not include "board.h".  It is now
clear what all accgyro drivers need to compile and what was
unnecessarily included before.
Merge remote-tracking branch 'multiwii/master' into
project-structure-alternative

Conflicts:
	src/sensors.c
Fix typo in filename.
Move FY90q acc/gyro code to accgyro_fy90q.c.  Update ADC drivers so they
do not include "board.h". It is now clear what all ADC drivers need to
compile and what was unnecessarily included before.

Note: FY90Q make target now compiles successfully, it was broken for
various reasons before.