Update Travis Config

* Explicitely test PHP 7.0 (instead of PHP nightly)
* Finish fast (give quicker feedback in PR)
* Remove Symfony 2.6 as it reached eom

Author: wouterj

.travis.yml

@@ -1,48 +1,44 @@
 language: php
 
 php:
-    - 5.3
-    - 5.4
-    - 5.5
-    - 5.6
-    - hhvm
-    - nightly
+  - 5.3
+  - 5.4
+  - 5.5
+  - 5.6
+  - 7.0
+  - hhvm
 
 sudo: false
 
 cache:
-    directories:
-        - $HOME/.composer/cache
+  directories:
+    - $HOME/.composer/cache
 
 env:
   - SYMFONY_VERSION=2.7.*
 
 matrix:
   include:
-    - php: 5.3
-      env: SYMFONY_VERSION=2.3.* COMPOSER_FLAGS="--prefer-lowest"
     - php: 5.6
       env: SYMFONY_VERSION=2.3.*
-    - php: 5.6
-      env: SYMFONY_VERSION=2.6.*
     - php: 5.6
       env: SYMFONY_VERSION=2.8.*
     - php: 5.6
       env: SYMFONY_VERSION=3.0.*
+    - php: 5.3
+      env: SYMFONY_VERSION=2.3.* COMPOSER_FLAGS="--prefer-lowest"
   allow_failures:
-    - php: nightly
-    - php: 5.6
-      env: SYMFONY_VERSION=2.8.*
-    - php: 5.6
-      env: SYMFONY_VERSION=3.0.*
+    - php: 7.0
+    - env: SYMFONY_VERSION=2.8.*
+    - env: SYMFONY_VERSION=3.0.*
+  fast_finish: true
 
 before_install:
   - composer self-update
-  
-install:
   - if [[ "$TRAVIS_PHP_VERSION" != "hhvm" ]]; then echo "memory_limit = -1" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini; fi
   - composer require symfony/symfony:${SYMFONY_VERSION} --no-update
-  - composer update --prefer-source $COMPOSER_FLAGS
+  
+install: composer update --prefer-source $COMPOSER_FLAGS
 
 script: phpunit --coverage-text