Fix build definition: Test WP 3.7 on PHP 5.6
Fix build definition: Test WP 3.7 on PHP 5.6

gitlost/wp-cli,GaryJones/wp-cli,trepmal/wp-cli,gitlost/wp-cli,rodrigoprimo/wp-cli,2ndkauboy/wp-cli,gitlost/wp-cli,aaemnnosttv/wp-cli,trepmal/wp-cli,GaryJones/wp-cli,2ndkauboy/wp-cli,trepmal/wp-cli,rodrigoprimo/wp-cli,aaemnnosttv/wp-cli,aaemnnosttv/wp-cli,rodrigoprimo/wp-cli,2ndkauboy/wp-cli,GaryJones/wp-cli