Travis improvements

Author: GrahamCampbell

.travis.yml

@@ -5,15 +5,24 @@ php:
   - 5.4
   - 5.5
   - 5.6
+  - hhvm
+  - hhvm-nightly
+
+matrix:
+    allow_failures:
+        - php: hhvm
+        - php: hhvm-nightly
 
 script:
- - vendor/phpunit/phpunit/composer/bin/phpunit -v
+ - vendor/bin/phpunit
 
 before_script:
  - sudo apt-get -qq update > /dev/null
  - phpenv rehash > /dev/null
  - composer selfupdate --quiet
- - composer install --dev --prefer-dist
+ - composer install --no-interaction --prefer-source --dev
+ - vendor/bin/phpunit
+ - composer update --no-interaction --prefer-source --dev
 
 notifications:
   irc: "irc.freenode.org#phpdocumentor"