Plone-app-imaging

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- portet tests to plone.app.testing
[tomgross]

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- Disable csrf protection when scale is generated and traversed to.
[vangheem]

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- Cache image scales using the plone.stableResource ruleset
when they are accessed via UID-based URLs.
[davisagli]

- Move propertysheet imaging_properties and the corresponding
utilities to Products.CMFPlone.
https://github.com/plone/plone.app.contenttypes/issues/82
[pbauer]

- Generate Progressive JPEG.
[kroman0]

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- Make getQuality always return an integer.

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- Make the quality of scaled images configurable through the configlet.
https://dev.plone.org/ticket/13337
[khink]

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* Avoid hard dependency on ATContentTypes.
[davisagli]