Fix: use the correct targets on Travis-CI

Reference:
http://till.klampaeckel.de/blog/archives/204-Whats-wrong-with-composer-and-your-.travis.yml.html
nope, because it is the APC opcode cache breaking things when you self-update a phar (keeping the old opcode cache partially, thus corrupting it). APCu us not an opcode cache, and opcache works fine with phar archives