PIMCORE-1829 - Custom metadata on pages

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2156 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
PIMCORE-1829 - Custom metadata on pages + database updatescript + install.sql

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2157 1f8fe7d8-47f0-464c-8d0a-336f4953ab05