Ignition -> Gazebo (#273)

Signed-off-by: Jenn Nguyen <[email protected]>

README.md

@@ -1,37 +1,36 @@
-# Ignition Messages: Protobuf messages and functions for robot applications
+# Gazebo Messages: Protobuf messages and functions for robot applications
 
 **Maintainer:** caguero AT openrobotics DOT org
 
-[![GitHub open issues](https://img.shields.io/github/issues-raw/ignitionrobotics/ign-msgs.svg)](https://github.com/ignitionrobotics/ign-msgs/issues)
-[![GitHub open pull requests](https://img.shields.io/github/issues-pr-raw/ignitionrobotics/ign-msgs.svg)](https://github.com/ignitionrobotics/ign-msgs/pulls)
+[![GitHub open issues](https://img.shields.io/github/issues-raw/gazebosim/gz-msgs.svg)](https://github.com/gazebosim/gz-msgs/issues)
+[![GitHub open pull requests](https://img.shields.io/github/issues-pr-raw/gazebosim/gz-msgs.svg)](https://github.com/gazebosim/gz-msgs/pulls)
 [![Discourse topics](https://img.shields.io/discourse/https/community.gazebosim.org/topics.svg)](https://community.gazebosim.org)
 [![Hex.pm](https://img.shields.io/hexpm/l/plug.svg)](https://www.apache.org/licenses/LICENSE-2.0)
 
 Build | Status
 -- | --
-Test coverage | [![codecov](https://codecov.io/gh/ignitionrobotics/ign-msgs/branch/ign-msgs5/graph/badge.svg)](https://codecov.io/gh/ignitionrobotics/ign-msgs)
+Test coverage | [![codecov](https://codecov.io/gh/gazebosim/gz-msgs/branch/ign-msgs5/graph/badge.svg)](https://codecov.io/gh/gazebosim/gz-msgs/branch/ign-msgs5)
 Ubuntu Bionic | [![Build Status](https://build.osrfoundation.org/buildStatus/icon?job=ignition_msgs-ci-ign-msgs5-bionic-amd64)](https://build.osrfoundation.org/job/ignition_msgs-ci-ign-msgs5-bionic-amd64)
 Homebrew      | [![Build Status](https://build.osrfoundation.org/buildStatus/icon?job=ignition_msgs-ci-ign-msgs5-homebrew-amd64)](https://build.osrfoundation.org/job/ignition_msgs-ci-ign-msgs5-homebrew-amd64)
 Windows       | [![Build Status](https://build.osrfoundation.org/buildStatus/icon?job=ignition_msgs-ci-ign-msgs5-windows7-amd64)](https://build.osrfoundation.org/job/ignition_msgs-ci-ign-msgs5-windows7-amd64)
 
-Ignition Messages is a component in the [Ignition](http://ignitionrobotics.org)
+Gazebo Messages is a component in the [Gazebo](http://gazebosim.org)
 framework, a set of libraries designed to rapidly develop robot applications.
 
 ## Installation
 
-See the [installation tutorial](https://ignitionrobotics.org/api/msgs/6.2/index.html).
+See the [installation tutorial](https://gazebosim.org/api/msgs/6.2/index.html).
 
 ## Known issue of command line tools
 
 In the event that the installation is a mix of Debian and from source, command
 line tools from `ign-tools` may not work correctly.
 
 A workaround is to define the environment variable
-`IGN_CONFIG_PATH` to point to the location of the Ignition library installation,
+`IGN_CONFIG_PATH` to point to the location of the Gazebo library installation,
 where the YAML file for the package is found, such as
 ```
 export IGN_CONFIG_PATH=/usr/local/share/ignition
 ```
 
-This issue is tracked [here](https://github.com/ignitionrobotics/ign-tools/issues/61).
-
+This issue is tracked [here](https://github.com/gazebosim/gz-tools/issues/61).