updated custom startup example

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3698 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
asset update bugfix (thumbnails are not cleaned when updating binary content)

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3699 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (2901) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3700 1f8fe7d8-47f0-464c-8d0a-336f4953ab05