Add elasticsearch node and gateway job

Added elasticsearch gateway and node jobs.
Before this PR can be merged the following blobs need to be added:
```
java/jre-7u4-linux-x64.tar.gz
elasticsearch/elasticsearch-0.20.6.tar.gz
elasticsearch/elasticsearch-http-basic-1.0.3.tar.gz
```

This PR depends on https://github.com/cloudfoundry/cf-services-contrib-release/pull/11