Restore Added support for running docker behind firewall

Dockerfile

@@ -1,6 +1,6 @@
 FROM maven:3-jdk-8
 
-RUN apt-get update && apt-get install -y --no-install-recommends graphviz && rm -rf /var/lib/apt/lists/*
+RUN apt-get update && apt-get install -y --no-install-recommends graphviz fonts-wqy-zenhei && rm -rf /var/lib/apt/lists/*
 ADD . /app
 WORKDIR /app
 EXPOSE 8080

README.md

@@ -44,6 +44,19 @@ The server is now listing to [http://localhost:8080/plantuml](http://localhost:8
 
 You may specity the port in `-p` Docker command line argument.
 
+Alternate: How to run the server with Tomcat + Docker?
+======================================================
+
+Above method uses maven to run the application. That requires internet connectivity. That is undesireable in a corporate environment with firewalls. So, you can use following command to create a self-contained docker image that will "just-work". 
+
+```
+docker build -t platuml-server:tomcat8 -f Dockerfile.tomcat8 . 
+docker run -d -p 8080:8080 plantuml-server:tomcat8
+```
+The server is now listing to [http://localhost:8080/plantuml](http://localhost:8080/plantuml).
+
+You may specity the port in `-p` Docker command line argument.
+ 
 
 How to generate the war
 =======================