Use composer installed PHPUnit on Travis

Author: DougSisk

.travis.yml

@@ -15,7 +15,7 @@ before_script:
 
 script:
   - mkdir -p build/logs
-  - phpunit --coverage-clover build/logs/clover.xml
+  - vendor/bin/phpunit --coverage-clover build/logs/clover.xml
 
 after_success:
   - sh -c 'if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then php vendor/bin/coveralls -v; fi;'