Issue title: Media Module
 Issue body: Complete the media module, enable uploading of images, videos - extraction of basic metadata and descriptions - enable them to then be used within content pages or to construct galleries (extra - may split the gallery piece out into another issue as is potentially a lot of work).

 Comments: 
 Comment 0: have you seen this? http://deepliquid.com/content/Jcrop.html

 Comment 1: Moved to https://github.com/dtan/calipso-media/issues/1

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