added AddForcePlugin2.cpp: add force to 2 links at the same time.
compile AddForcePlugin2 in catkin.cmake
added comment line to SetVelPlugin.cpp
added manip-obj-with-hand.l
added drum_body.l : this model was converted from google scketchup model.
rename manip-obj-with-hand.l -> manip-obj-with-hand-main.l
added manip-obj-with-hand-strategy.l
added manip-obj-with-hand-analyze.l
added manip-obj-with-hand-plot.l
add manip-obj-with-hand-util.l
moved functions from manip-obj-with-hand-main.l to other files
added manip-obj-with-hand-manip.l
moved functions from manip-obj-with-hand-main.l to other files
added manip-obj-with-hand-generate.l
added load files in main.l
changed variables' name
refactoring manip-obj-with-hand
fixed minor bug and typo
added functions to generate strategy manip
added function main-strategy to test all strategy.