add php 5.5 to travis test
add php 5.5 to travis test
dleffler/scssphp,leafo/scssphp,g105b/scssphp,webdevid/scssphp,dleffler/scssphp,g105b/scssphp,g105b/scssphp,leafo/scssphp,leafo/scssphp,webdevid/scssphp,dleffler/scssphp,kkkyyy03/scssphp,webdevid/scssphp