Fixed compilation issue. Cc @sarah-widder . Fix #19.
Fixed compilation issue. Cc @sarah-widder . Fix #19.

ScazLab/baxter_collaboration,ScazLab/human_robot_collaboration,ScazLab/baxter_collaboration,ScazLab/baxter_collaboration,ScazLab/human_robot_collaboration,ScazLab/baxter_collaboration,ScazLab/human_robot_collaboration,ScazLab/human_robot_collaboration