Ftw-colorbox

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- Add test setup.
[mbaechtold]

- Add image scale so the image dimensions can be configured.
[mbaechtold]

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- Exclude colorbox-initialization into a function
[elioschmutz]

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- Made colorbox fullscreen and repositioned forward/back buttons.
[lknoepfel]

- Updated library to v1.5.9.
[lknoepfel]

- Update French and English translations.
[jone]

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- Fix jq issue in JavaScript by fixing the scope and using $.
[mathias.leimgruber]

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- Fix MANIFEST.in
[mathias.leimgruber]

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- Fix package structure.
[mathias.leimgruber]