Temporarily run tests without phing on HHVM

Phing doesn't yet support HHVM, so run tests directly
in this environment. This can be reverted in future
once we can run phing (hhvm support is planned for
2.9.0).

.travis.yml

@@ -13,7 +13,11 @@ before_install:
 before_script:
   - "composer install --prefer-dist"
 
-script: "vendor/bin/phing test"
+script:
+  # Standard build script
+  - if [[ $TRAVIS_PHP_VERSION != "hhvm" ]] ; then vendor/bin/phing test; fi
+  # HHVM script (phing not currently supported on hhvm pending http://www.phing.info/trac/ticket/1086)
+  - if [[ $TRAVIS_PHP_VERSION == "hhvm" ]] ; then ./vendor/bin/phpunit --bootstrap=modules/unittest/bootstrap_all_modules.php modules/unittest/tests.php ; fi
 
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