allow blank lines and comments in scripts

Blank lines used to work in scripts.  Broke recently.  Fixing that.

Also allowing comments starting with #.

Also add trace command to see commands as they execute.
add ability to execute previously planned paths + computation of cartesian paths
added more commands (including groun)
allow PoseStamped in set_pose_target
make use of orientation consistent with tf
ignore cmd directory
add jump_threshold
Merge branch 'groovy-devel' of https://github.com/ros-planning/moveit_commander into groovy-devel
(really felix this time) -- added add_mesh
return the fraction of the path as well
added avoid_collisions flag to compute_cartesian_path
remove API for following constraints
0.3.5
Merge branch 'groovy-devel' of github.com:ipa-raw3-1/moveit_commander into groovy-devel
added sleeps
switch to argparse
0.3.6
Merge pull request #2 from ipa-raw3-1/groovy-devel

Changes from rob@work
merge fixes
changes from refactoring of py bindings in moveit_ros