Update travis config to test with symfony 2.8/3.0 on php 5.6/7.0

Author: Luis Pabon

.travis.yml

@@ -5,6 +5,7 @@ php:
   - 5.4
   - 5.5
   - 5.6
+  - 7.0
   - hhvm
   - nightly
 
@@ -20,25 +21,26 @@ matrix:
     - php: 5.6
       env: SYMFONY_VERSION=2.6.*
     - php: 5.6
-      env: SYMFONY_VERSION=2.7.*@dev
+      env: SYMFONY_VERSION=2.7.*
     - php: 5.6
-      env: SYMFONY_VERSION=2.8.*@dev
+      env: SYMFONY_VERSION=2.8.*
+    - php: 7.0
+      env: SYMFONY_VERSION=2.8.*
     - php: 5.6
-      env: SYMFONY_VERSION="3.0.x-dev as 2.6"
+      env: SYMFONY_VERSION=3.0.*
+    - php: 7.0
+      env: SYMFONY_VERSION=3.0.*
   allow_failures:
     - php: hhvm
     - php: nightly
-    - env: SYMFONY_VERSION=2.7.*@dev
-    - env: SYMFONY_VERSION=2.8.*@dev
-    - env: SYMFONY_VERSION="3.0.x-dev as 2.6"
 
 cache:
   directories:
     - vendor
     - $HOME/.composer/cache
 
 before_script:
-  - echo "extension=mongo.so" >> `php --ini | grep "Loaded Configuration" | sed -e "s|.*:\s*||"`
+  - echo "extension = mongo.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
   - composer selfupdate
   - if [ "$SYMFONY_VERSION" != "" ]; then composer require "symfony/symfony:${SYMFONY_VERSION}" --no-update; fi;
   - composer update --prefer-dist --no-interaction $COMPOSER_FLAGS