just use built in phpunit on travis ci

Author: chrisboulton

.travis.yml

@@ -9,4 +9,4 @@ before_script:
   - sh -c "if [ $REDIS_STANDALONE -eq 0 ]; then wget https://github.com/nicolasff/phpredis/archive/2.2.2.zip -O php-redis.zip && unzip php-redis.zip; fi"
   - sh -c "if [ $REDIS_STANDALONE -eq 0 ]; then cd phpredis-2.2.2/ && phpize && ./configure && make && make install; fi"
   - sh -c "if [ $REDIS_STANDALONE -eq 0 ]; then echo \"extension=redis.so\" >> `php --ini | grep \"Loaded Configuration\" | sed -e \"s|.*:\s*||\"`; fi"
-  - composer install --dev
+  - composer install