check for nans and bad step sizes
Merge pull request #92 from jonbinney/7_19

check for nans and bad step sizes
Fix spelling error in cmake file.
1.11.2
find_package angles
1.11.3
robot_pose_ekf: use tf_prefix to lookup and send transforms
Merge pull request #95 from mintar/ekf_tf_prefix_hydro

robot_pose_ekf: use tf_prefix to lookup and send transforms
Potential missing dependency
Merge remote-tracking branch 'upstream/hydro-devel' into hydro