Revert "Added compiler conditionals for PCL 1.6 and 1.7 changes"

This reverts commit a53077c84f63dbfcd61e2000c4968f4f34c506af.

Conflicts:

	gazebo_plugins/CMakeLists.txt
	gazebo_plugins/src/gazebo_ros_depth_camera.cpp
	gazebo_plugins/src/pcl_conversions_compatibility.h
Revert "Added PCL to package.xml"

This reverts commit 6b3b0b86178df29ab569def03954fec5f813a383.
Merge branch 'hydro-devel' of github.com:ros-simulation/gazebo_ros_pkgs into hydro-pcl-conversions
ROS Video Plugin for Gazebo - allows displaying an image stream in an OGRE texture inside gazebo. Also provides a fix for #85.
Remove find_package(SDF) from CMakeLists.txt

It is sufficient to find gazebo, which will export the information
about the SDFormat package.
Merge pull request #87 from ros-simulation/remove_SDF_find_package_hydro

Remove find_package(SDF) from CMakeLists.txt
Merged hydro-devel
Added back PCL dependency
removed ros initialization from plugin
Merge branch 'hydro-devel' into add_video_plugin
Fixed template
fixed node intialization conflict between gzserver and gzclient. better adherance to gazebo style guidelines
Merge pull request #86 from piyushk/add_video_plugin

ROS Video Plugin for Gazebo - allows displaying an image stream in an OG...
Merge pull request #89 from ros-simulation/hydro-pcl-conversions

Add Grooby pcl_conversions
Merged hydro branch