Collective-videolink

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- Nothing changed yet.

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* now "unshortens" urls from goo.gl and flickr [pigeonflight]
* supports embedding flickr albums [pigeonflight]

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* version bump [pigeonflight]

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* updated changelog and readme

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* added soundcloud and experimental google drive video support [pigeonflight]
* now works with Plone 5 [pigeonflight]
* further customisations to the embeddedvideo listings view and individual view [pigeonflight]
* added dependency on plone.patternslib and videos now use pat-inject to load inline;fixed thumbnailing so that thumbnails are created on creation not just modification of a video link [pigeonflight]
* refactored to use a custom marker interface "IVideoLinkOembedable" as a strategy for overriding the default link view with a video view; we no longer implement our own display view in the display menu [pigeonflight]
* test suite updated to work with plone.app.testing

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* replaced collective.colorbox with collective.prettyphoto [pigeonflight]
* do not purge viewmethods [cleder]
* use metal:content-core fill-slot="content-core" to simplify pagetemplate [cleder]
* added embeddedvideos view to Collections and Folders [pigeonflight]
* known to work with Plone 4.2 and 4.3