initial commit for accessing document editables over fluent interfaces

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@4277 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
implemented srcset on thumbnails (tag & thumb) + deferred thumb generation support for thumb-class

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@4278 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
removed srcset

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@4279 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
user management: temp. login link for admins to test permissions without knowing the password

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@4280 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (3074) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@4281 1f8fe7d8-47f0-464c-8d0a-336f4953ab05