Better attitude filter, not sensitive to sudden accelerations
Removed unused files
Merge branch 'master' of github.com:PX4/Firmware into attitude_filter_improvement
Merge remote-tracking branch 'upstream/master' into attitude_filter_improvement
Merge remote-tracking branch 'upstream/master' into attitude_filter_improvement
Changed names and default values of attitude estimator parameters
Merge branch 'attitude_filter_improvement' into flow_try

Conflicts:
	apps/attitude_estimator_ekf/attitude_estimator_ekf_params.c