add test case for PMA_relation
Merge branch 'master' of https://github.com/phpmyadmin/phpmyadmin into UT_plu_parse
Merge branch 'master' of https://github.com/phpmyadmin/phpmyadmin into UT_plu_parse
Merge pull request #533 from adamgsoc2013/UT_plu_parse

add test case for PMA_relation