enabled Symfony 3.0 support

Author: lsmith77

Diff for: .travis.yml

@@ -1,23 +1,32 @@
 language: php
 
 php:
-  - 5.3
   - 5.4
   - 5.5
   - 5.6
   - 7.0
   - hhvm
 
+sudo: false
+
+cache:
+  directories:
+    - $HOME/.composer/cache/files
+
 matrix:
-  allow_failures:
-    - php: 7.0
-    - php: hhvm
+  fast_finish: true
   include:
-    - php: 5.3
+    - php: 5.6
+      env: SYMFONY_VERSION='2.8.*@dev'
+    - php: 5.6
+      env: SYMFONY_VERSION='3.0.*@dev'
+    - php: 5.4
       env: 'COMPOSER_FLAGS="--prefer-stable --prefer-lowest"'
 
 before_script:
+  - if [[ "$TRAVIS_PHP_VERSION" != "hhvm" ]]; then echo "memory_limit = -1" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini; fi
   - travis_retry composer self-update
+  - if [ "$SYMFONY_VERSION" != "" ]; then composer require --dev --no-update symfony/symfony=$SYMFONY_VERSION; fi
   - travis_retry composer update ${COMPOSER_FLAGS} --no-interaction
 
 script:

Diff for: composer.json

@@ -12,9 +12,10 @@
         }
     ],
     "require": {
-        "php": ">=5.3.2",
+        "php": ">=5.4.0",
         "jms/serializer": "^1.0.0",
-        "symfony/framework-bundle": "~2.1"
+        "phpoption/phpoption": "^1.0.0",
+        "symfony/framework-bundle": "~2.3|~3.0"
     },
     "require-dev": {
         "symfony/yaml": "*",
@@ -37,6 +38,7 @@
         "psr-0": { "JMS\\SerializerBundle": "" }
     },
     "minimum-stability": "dev",
+    "prefer-stable": true,
     "target-dir": "JMS/SerializerBundle",
     "extra": {
         "branch-alias": {