Java and .NET Workers can co-exist

Added a docker-compose-javaworker.yml file and Dockerfile.j as well as restoring the worker Java source so there are two different versions now.

worker/Dockerfile

@@ -1,11 +1,11 @@
 FROM microsoft/dotnet:1.0.0-preview2-sdk
 
-WORKDIR /app
+WORKDIR /code
 
-ADD src/ /app/src/
+ADD src/Worker /code/src/Worker
 
 RUN dotnet restore -v minimal src/ \
     && dotnet publish -c Release -o ./ src/Worker/ \
     && rm -rf src/ $HOME/.nuget/
 
-CMD dotnet Worker.dll
+CMD dotnet Worker.dll