Improved HIL startup script, added highres HIL receive routine
Fix gyro measurement noise variance
Hotfix missing yaw deadzone default (leads to continuous turns since zero speed is never commanded)
Merge branch 'master' of github.com:PX4/Firmware into hil
Added generation of pressure altitude in highres IMU message mode
Merge pull request #244 from PX4/hil

Small HIL improvements
Fixed axis in L3GD20 driver
Merge pull request #245 from julianoes/hotfix_l3gd20_axes

Fixed axis in L3GD20 driver