Add image to clusters #12
Bug fix for 

{
"graphType": "InstallationType",
"minWeight": 1,
"noedges": false,
"prj_id": "521c4ce03aef584fcf66aa7c",
"run_id": "521c54073aef584fcf66d90f"
}

not working
Merge pull request #67 from cassandra-project/develop

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