[Gazebo] Updating MAINTAINER and version bump

* Updating MAINTAINER field to Steven Peters (osrf/docker_templates#6)
* Version bump for gazebo 5, 6, and 7

library/gazebo

@@ -1,18 +1,18 @@
 # maintainer: Nate Koenig <[email protected]> (@nkoenig)
 
-gzserver4:      git://github.com/osrf/docker_images@4a416dd524f567314c45aecf4e0fe917e0576f55 gazebo/gazebo4/gzserver4
-libgazebo4:     git://github.com/osrf/docker_images@4a416dd524f567314c45aecf4e0fe917e0576f55 gazebo/gazebo4/libgazebo4
+gzserver4:      git://github.com/osrf/docker_images@40b2e3c4b6fa61132c4b5f2ccbc7ae9bfff7cf8e gazebo/gazebo4/gzserver4
+libgazebo4:     git://github.com/osrf/docker_images@40b2e3c4b6fa61132c4b5f2ccbc7ae9bfff7cf8e gazebo/gazebo4/libgazebo4
 # Docker EOL: 2016-01-25
 
-gzserver5:      git://github.com/osrf/docker_images@4a416dd524f567314c45aecf4e0fe917e0576f55 gazebo/gazebo5/gzserver5
-libgazebo5:     git://github.com/osrf/docker_images@4a416dd524f567314c45aecf4e0fe917e0576f55 gazebo/gazebo5/libgazebo5
+gzserver5:      git://github.com/osrf/docker_images@40b2e3c4b6fa61132c4b5f2ccbc7ae9bfff7cf8e gazebo/gazebo5/gzserver5
+libgazebo5:     git://github.com/osrf/docker_images@40b2e3c4b6fa61132c4b5f2ccbc7ae9bfff7cf8e gazebo/gazebo5/libgazebo5
 # Docker EOL: 2017-01-25
 
-gzserver6:      git://github.com/osrf/docker_images@4a416dd524f567314c45aecf4e0fe917e0576f55 gazebo/gazebo6/gzserver6
-libgazebo6:     git://github.com/osrf/docker_images@4a416dd524f567314c45aecf4e0fe917e0576f55 gazebo/gazebo6/libgazebo6
+gzserver6:      git://github.com/osrf/docker_images@40b2e3c4b6fa61132c4b5f2ccbc7ae9bfff7cf8e gazebo/gazebo6/gzserver6
+libgazebo6:     git://github.com/osrf/docker_images@40b2e3c4b6fa61132c4b5f2ccbc7ae9bfff7cf8e gazebo/gazebo6/libgazebo6
 # Docker EOL: 2017-01-25
 
-gzserver7:      git://github.com/osrf/docker_images@4a416dd524f567314c45aecf4e0fe917e0576f55 gazebo/gazebo7/gzserver7
-libgazebo7:     git://github.com/osrf/docker_images@4a416dd524f567314c45aecf4e0fe917e0576f55 gazebo/gazebo7/libgazebo7
-latest:         git://github.com/osrf/docker_images@4a416dd524f567314c45aecf4e0fe917e0576f55 gazebo/gazebo7/libgazebo7
+gzserver7:      git://github.com/osrf/docker_images@40b2e3c4b6fa61132c4b5f2ccbc7ae9bfff7cf8e gazebo/gazebo7/gzserver7
+libgazebo7:     git://github.com/osrf/docker_images@40b2e3c4b6fa61132c4b5f2ccbc7ae9bfff7cf8e gazebo/gazebo7/libgazebo7
+latest:         git://github.com/osrf/docker_images@40b2e3c4b6fa61132c4b5f2ccbc7ae9bfff7cf8e gazebo/gazebo7/libgazebo7
 # Docker EOL: 2021-01-25