asset stream refactoring: refactored  recycle bin to use streams and binary files, refactored versions to use a separate binary file, removed memory_limit from upload limit calculation

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3818 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
asset: fixed problem with zero size assets in combination with webdav + some optimizations

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3819 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
recyclebin: removed filesize limit and improved restore and add

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3820 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
tree preview: remove loading indicator background when preview is loaded

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3821 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (2939) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3822 1f8fe7d8-47f0-464c-8d0a-336f4953ab05