* pcl_conversion to ros2
* travis for ros2 and fixed cmakelists
* exporting dependencies
* updated travis
* fixed smaller things
* added colcon ignore to meta package
* merge pcl_conversions.h with version released in Dashing
* merge test script, CMakeListst, package.xml
* append authors, clean up
* PR feedback
* fixed PR comments
* fixed PR comments, cmakelists message_filters, reverted type masq, added maintainer
* removed dashing and made ros_distro matrix env
```
% catkin lint .
pcl_ros: error: nodelet plugin file 'plugins/nodelet/libpcl_ros_features.xml' is not installed to ${CATKIN_PACKAGE_SHARE_DESTINATION}
pcl_ros: error: nodelet plugin file 'plugins/nodelet/libpcl_ros_filters.xml' is not installed to ${CATKIN_PACKAGE_SHARE_DESTINATION}
pcl_ros: error: nodelet plugin file 'plugins/nodelet/libpcl_ros_io.xml' is not installed to ${CATKIN_PACKAGE_SHARE_DESTINATION}
pcl_ros: error: nodelet plugin file 'plugins/nodelet/libpcl_ros_segmentation.xml' is not installed to ${CATKIN_PACKAGE_SHARE_DESTINATION}
pcl_ros: error: nodelet plugin file 'plugins/nodelet/libpcl_ros_surface.xml' is not installed to ${CATKIN_PACKAGE_SHARE_DESTINATION}
pcl_ros: error: unconfigured build_depend on 'message_filters'
catkin_lint: checked 1 packages and found 6 problems
catkin_lint: 40 notices have been ignored. Use -W2 to see them
```
* Remove dependency on vtk/libproj-dev
These dependencies were introduced in #124 to temporarily fix
missing / wrong dependencies in upstream vtk. This hack is no longer
necessary, since fixed vtk packages have been uploaded to
packages.ros.org (see #124 and ros-infrastructure/reprepro-updater#32).
* Remove vtk hack from CMakeLists.txt
