Being a bit more efficient with Travis resources

Author: matthiasnoback

.travis.yml

@@ -8,18 +8,27 @@ php:
   - hhvm
 
 matrix:
-  allow_failures:
+  include:
+    - php: 5.6
+      env: SYMFONY_VERSION=2.0.* PHPUNIT_VERSION=~4.0
+    - php: 5.6
+      env: SYMFONY_VERSION=2.1.* PHPUNIT_VERSION=~4.0
+    - php: 5.6
+      env: SYMFONY_VERSION=2.2.* PHPUNIT_VERSION=~4.0
+    - php: 5.6
+      env: SYMFONY_VERSION=2.3.* PHPUNIT_VERSION=~4.0
+    - php: 5.6
+      env: SYMFONY_VERSION=2.4.* PHPUNIT_VERSION=~4.0
+    - php: 5.6
+      env: SYMFONY_VERSION=2.5.* PHPUNIT_VERSION=~4.0
+    - php: 5.6
+      env: SYMFONY_VERSION=2.6.* PHPUNIT_VERSION=~4.0
+    - php: 5.6
+      env: SYMFONY_VERSION=2.6.* PHPUNIT_VERSION=~3.7
     - php: hhvm
-
-env:
-  - SYMFONY_VERSION=2.6.* PHPUNIT_VERSION=~3.7
-  - SYMFONY_VERSION=2.0.* PHPUNIT_VERSION=~4.0
-  - SYMFONY_VERSION=2.1.* PHPUNIT_VERSION=~4.0
-  - SYMFONY_VERSION=2.2.* PHPUNIT_VERSION=~4.0
-  - SYMFONY_VERSION=2.3.* PHPUNIT_VERSION=~4.0
-  - SYMFONY_VERSION=2.4.* PHPUNIT_VERSION=~4.0
-  - SYMFONY_VERSION=2.5.* PHPUNIT_VERSION=~4.0
-  - SYMFONY_VERSION=2.6.* PHPUNIT_VERSION=~4.0
+      env: SYMFONY_VERSION=2.6.* PHPUNIT_VERSION=~4.0
+    - php: 5.6
+      env: SYMFONY_VERSION=2.7.*@dev PHPUNIT_VERSION=~4.0
 
 before_script:
   - composer require --no-update "symfony/config:${SYMFONY_VERSION}"