liip/LiipImagineBundle — pull request #52 by lucasaba (2012-03-04 10:34:53+00:00)
Title: Adds a new loader for pdf preview

PdfPreviewLoader is an example of how, with a loader, it
possible to preview virtually any file system type.
Extending FileSystemLoader, thanks to Lukas's code, PdfPreviewLoader
generate a png image of the first page of the pdf document and
updates the infos of the file to be rendered.

I think that it would e better to pass from config the number of the page to be extracted and the image format to use but... I'm not sure how this could be done...