REST: added call which returns the key value definition

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2463 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
checkstyle fixes

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2464 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
PIMCORE-1876 - Do not allow "admin", "webservice", "install" and "plugin" as name for documents in the first level (system routes)

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2465 1f8fe7d8-47f0-464c-8d0a-336f4953ab05