Switch to the Docker-based infrastructure on Travis

.travis.yml

@@ -1,23 +1,27 @@
 language: php
 
+sudo: false
+
+cache:
+  directories:
+    - $HOME/.composer/cache
+
 php: [5.3, 5.4, 5.5, 5.6, hhvm]
 
 before_install:
   # Force using Goutte 2 on HHVM for now because Guzzle 6 is broken there
   - if [ "hhvm" = "$TRAVIS_PHP_VERSION" ]; then composer require fabpot/goutte '~2' --no-update; fi
 
-before_script:
-  - export WEB_FIXTURES_HOST=http://localhost
+install:
+  - composer install
 
-  - composer install --dev --prefer-source
+before_script:
+  - export WEB_FIXTURES_HOST=http://localhost:8000
 
-  - sudo apt-get update
-  - sudo apt-get install -y --force-yes apache2 libapache2-mod-php5
-  - sudo sed -i -e "s,/var/www,$(pwd)/vendor/behat/mink/driver-testsuite/web-fixtures,g" /etc/apache2/sites-available/default
-  - sudo /etc/init.d/apache2 restart
+  # Start a webserver for web fixtures. Force using PHP 5.6 to be able to run it on PHP 5.3 and HHVM jobs too
+  - ~/.phpenv/versions/5.6/bin/php -S localhost:8000 -t vendor/behat/mink/driver-testsuite/web-fixtures > /dev/null 2>&1 &
 
 script: phpunit -v --coverage-clover=coverage.clover
 
 after_script:
-  - wget https://scrutinizer-ci.com/ocular.phar
-  - php ocular.phar code-coverage:upload --format=php-clover coverage.clover
+  - wget https://scrutinizer-ci.com/ocular.phar && php ocular.phar code-coverage:upload --format=php-clover coverage.clover