PIMCORE-2092 - assets: changed chmod to 0755 instead of 0766

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3863 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
unified writing files (file_put_contents) and creating dirs (mkdir), this is especially to centrally manage file/folder permissions

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3864 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (2952) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3865 1f8fe7d8-47f0-464c-8d0a-336f4953ab05