Added script to set up extension

As per https://github.com/travis-ci/travis-ci/issues/2523 it appears that the
php.ini on hhvm is in a different place. Created a script to write the
extensions to the right php.ini based on the environment.

.travis.yml

@@ -29,9 +29,7 @@ install:
   - composer install
 
 before_script:
-  - echo "extension = memcache.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
-  - echo "extension = memcached.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
-  - echo "extension = redis.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
+  - ./tests/travis.sh
   - mysql -e "create database IF NOT EXISTS test;" -u root
   - mysql test < tests/schema.sql -u root
   - mkdir -p build/logs

tests/travis.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+VERSION=`phpenv version-name`
+
+if [ "$VERSION" -eq "hhvm" ]
+then
+    PHPINI=/etc/hhvm/php.ini
+else
+    PHPINI="~/.phpenv/versions/$VERSION/etc/php.ini"
+fi
+
+echo "extension = memcache.so"  >> $PHPINI
+echo "extension = memcached.so" >> $PHPINI
+echo "extension = redis.so"     >> $PHPINI