Fix up rmw repos (#53)

* Fix rmw repos (add idl support) but leave them commented, as some users might not have them.

* Add documentation to explain how to use other rmw implementations.

Author: Duncan Calvert

ros2_java_desktop.repos

@@ -87,6 +87,10 @@ repositories:
     type: git
     url: https://github.com/ros2/rmw_connext.git
     version: master
+  ros2/rosidl_typesupport_connext:
+    type: git
+    url: https://github.com/ros2/rosidl_typesupport_connext.git
+    version: master
   ros2/rmw_fastrtps:
     type: git
     url: https://github.com/ros2/rmw_fastrtps.git
@@ -95,10 +99,14 @@ repositories:
     type: git
     url: https://github.com/ros2/rmw_implementation.git
     version: master
-#  ros2/rmw_opensplice:
-#    type: git
-#    url: https://github.com/ros2/rmw_opensplice.git
-#    version: master
+  ros2/rmw_opensplice:
+    type: git
+    url: https://github.com/ros2/rmw_opensplice.git
+    version: master
+  ros2/rosidl_typesupport_opensplice:
+    type: git
+    url: https://github.com/ros2/rosidl_typesupport_opensplice.git
+    version: master
   ros2/ros1_bridge:
     type: git
     url: https://github.com/ros2/ros1_bridge.git