Added printer management to admin
Small changes to admin templates
    - cmfive now loads the preview in an iframe colorbox to avoid any included CSS breaking the layout
    - With the above, because of that, if a template fails to render then it doesn't crash the entire page with cryptic error messages
Merge branch '0-7-0-BRANCH' of https://github.com/careck/cmfive into 0-7-0-BRANCH