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

This reverts commit 5147b6fce0a6cdc05c7dd798e07e2bb16131ddfa.
Revert "Trimmed the branch to only the jsk_pcl_ros sub directory"

This reverts commit b221fe16ed3575ed0cbbe0c5139b573fc8f86ce2.
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