added pjpeg to allows types in asset preview

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2165 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
inkscape with imagick fallback image adapter  (must be set manually in the code)

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2166 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
inkscape: removed debug logging sterr/stout

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2167 1f8fe7d8-47f0-464c-8d0a-336f4953ab05