Merge pull request #55 from John5/issue1760

Resolved issue #1760 - getThumbnail() now returns an object instead of a path.

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2754 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
PIMCORE-1943 - HighRes Thumbnails (eg. Retina, Print 300dpi, ...)

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2755 1f8fe7d8-47f0-464c-8d0a-336f4953ab05