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

This reverts commit ef2036172f3f7362552fd6c140b3bdb99085631d.
Revert "Trimmed the branch to only the jsk_pcl_ros sub directory"

This reverts commit 1f164b06b4035cd9983839709d36ea38d7524198.
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