Adding files to execute shutdown after n number of runs

After merging these files, compile by navigating to the selenium directory and on command line
```
./go
./go selenium-server-standalone 
```
that builds the jar, now on command line, still in the selenium directory
```
java -jar jarspawner.jar mygrid.jar -role node -hub http://localhost:4444/grid/register -nodeConfig config.txt 
java -jar  build/java/server/src/org/openqa/grid/selenium/selenium-standalone.jar -role node -hub http://localhost:4444/grid/register -nodeConfig node_config.txt
```