added sorting to list of nodes and topics

README.md

@@ -15,6 +15,10 @@ Make sure you have the web_video_server installed:
 
 	sudo apt-get install ros-indigo-web-video-server 
 
+Make sure you have ROSBridge installed:
+
+	sudo apt-get install ros-indigo-rosbridge-suite 
+
 Then run the bash file in the working directory by running the following in the terminal.
 
     bash launch.bash