Enable redis and apc extensions.

This will increase coverage and help ensure redis/apc caching works.

.travis.yml

@@ -64,6 +64,8 @@ before_script:
   - sh -c "if [ '$COVERALLS' = '1' ]; then mkdir -p build/logs; fi"
 
   - sh -c "if [ '$HHVM' != '1' ]; then echo 'extension = memcached.so' >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi"
+  - sh -c "if [ '$HHVM' != '1' ]; then echo 'extension = redis.so' >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi"
+  - sh -c "if [ '$HHVM' != '1' ]; then echo 'extension = apc.so' >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi"
   - sh -c "if [ '$HHVM' = '1' ]; then composer require lorenzo/multiple-iterator=~1.0; fi"
 
   - phpenv rehash