Raptus.article.teaser

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- Nothing changed yet.

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* Prevent UnicodeDecodeError when generating the teaser image output [skaeser]

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* Make the package compatible with plone.app.imagecropping >= 1.0

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* Add a property ``teaser_rel_attribute`` to be able to use a js-gallery
product other than `Products.jsImagePopups`.

eg set it to ``prettyPhoto`` to use `collective.prettyphoto`.

(this fixes 2) [fRiSi]

* Add properties ``teaser_*_scale`` to be able to use plone.app.imaging
scales instead of the raptus.article image sizes.

This allows us to use `plone.app.imagecropping`_ [fRiSi]

.. _plone.app.imagecropping: https://pypi.python.org/pypi/plone.app.imagecropping

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* Use image scales defined in plone.app.imaging if it's available
and hard-coded ones if it's not. [fRiSi]
* Make teaser images croppable using plone.app.imagecropping if
it's installed. [fRiSi]

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* No longer link to images if the displayed image is larger than the one linked to