Currently the resized images are quite heavily artefacted. It would be nice if the user (or possibly the server owner) could set custom compression levels to trade off size/quality.

Short description

Add an option to make the creation date (as defined in the EXIF information) of a media object visible, e.g. to show when a photo was taken, not when it was added to the mediagoblin instance.

This should be optional since not everyone might want this information to be visible.

User stories

Sysadmin makes creation date visible for media objects

Shaquannah the sysadmin updates the configuration file for her mediagoblin instance and sets original_date_visible to true to show when pictures (or other media objects with the corresponding EXIF information) were taken/created.

Visitor sees the creation date for a given media object

Spencer the guest browses to a media object's page and sees the date for when a picture (or other media object given EXIF information) was taken/created. Spencer sees this information in the sidebar, below the date indicating when the media object was added to the mediagoblin instance he's visiting.

This is pre-work for the PDF media type handling which is supposed to show default pdf fallback icons in the beginning.

Please consider merging the branch get_thumb_url from my git repo at ​git://gitorious.org/~spaetz/mediagoblin/spaetz-mediagoblin.git.

Description of my change straight from the commit log:

    Simplify/Robustify the thumbnail URL usage in templates
    
    So far templates required a very complex blurb to simply insert a
    thumbnail URL, exposing much of the internal logic to the template
    designer. In addition, we would fail with an error if for some
    reason the media_files['thumb'] entry was never populated.
    
    This adds the MediaEntry.thumb_url property that template designers
    can simply use. It will do the right thing, either fetching the proper
    thumbnail or hand back a generic icon specified in a media's
    MEDIA_MANAGER as "default_thumb".
    
    Add an image default fallback icon (stolen from Tangos, which are
    Public Domain since version 0.8.90 as I understand) since the one
    we referred to was not existing. Perhaps, a "broken image" icon
    would be better, but I'll leave that to our capable designers.
    
    All templates have been modified to make use of the new thumb_url
    function.