Corrects the output of the image api get_all_images command

Should be:

resource: "ProjectHanlon::Slice::Image"
command: "get_all_images"
result: "Ok"
http_err_code: 200
errcode: 0

Fixes #246
Merge pull request #247 from mtnbikenc/issue-246

Fixes #246 Corrects the output of the image api get_all_images command