update Travis configuration

* run builds on the container based infrastructure
* allow to finish as fast as possible (when either a mandatorybuild
  failed or when only builds allowed to fail have not completed yet)
* additionally run tests on PHP 7.0, HHVM and HHVM Nightly where
  applicable
* send code coverage reports in HHVM builds too

Author: xabbuh

.travis.yml

@@ -5,11 +5,19 @@ php:
   - 5.4
   - 5.5
   - 5.6
+  - 7.0
+  - hhvm
+  - hhvm-nightly
+
+matrix:
+  fast_finish: true
+  allow_failures:
+    - php: hhvm-nightly
 
 install:
   - composer install
 
 script:
   - phpunit --coverage-clover=coverage.clover
-  - sh -c 'if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then wget https://scrutinizer-ci.com/ocular.phar; fi'
-  - sh -c 'if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then php ocular.phar code-coverage:upload --format=php-clover coverage.clover; fi'
+  - wget https://scrutinizer-ci.com/ocular.phar
+  - php ocular.phar code-coverage:upload --format=php-clover coverage.clover