Revert "comment out ml_classifiers that is not have entory in rosdep"

This reverts commit ddbdc9e9c0571a64d6b089e33d2b6cff1c70273f.
Revert "Trimmed the branch to only the jsk_pcl_ros sub directory"

This reverts commit 8993dee84e385b28f8bdfbb7bbb5f94cf53bc663.
Rebase from 'upstream'
Trimmed the branch to only the jsk_pcl_ros sub directory
comment out ml_classifiers that is not have entory in rosdep