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

This reverts commit fe567b95f4a43785519d97d16f067377a2f90d4c.
Revert "Trimmed the branch to only the jsk_pcl_ros sub directory"

This reverts commit 9e001876075cf6890ffdcf8fe43c4e6e14cff569.
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