minor #1454 fixed deprecation warnings (fabpot)

This PR was merged into the 1.3 branch.

Discussion
----------

fixed deprecation warnings

Commits
-------

dee8492b fixed deprecation warnings

.travis.yml

@@ -11,7 +11,7 @@ before_install:
 
 before_script:
     # symfony/*
-    - sh -c "if [ '$TWIG_VERSION' != '2.0' ]; then sed -i 's/~1.8|~2.0/~1.8/g' composer.json; composer update; fi"
+    - sh -c "if [ '$TWIG_VERSION' != '2.0' ]; then sed -i 's/~1\.28|~2\.0/~1.28/g' composer.json; php -d memory_limit=-1 `which composer` update; fi"
     - sh -c "if [ '$SYMFONY_DEPS_VERSION' = '3.0' ]; then sed -i 's/~2\.3|3\.0\.\*/3.0.*@dev/g' composer.json; composer update; fi"
     - sh -c "if [ '$SYMFONY_DEPS_VERSION' = '2.8' ]; then sed -i 's/~2\.3|3\.0\.\*/2.8.*@dev/g' composer.json; composer update; fi"
     - sh -c "if [ '$SYMFONY_DEPS_VERSION' = '' ]; then sed -i 's/~2\.3|3\.0\.\*/2.7.*@dev/g' composer.json; composer update; fi"

composer.json

@@ -40,7 +40,7 @@
         "symfony/translation": "~2.3|3.0.*",
         "symfony/twig-bridge": "~2.3|3.0.*",
         "symfony/validator": "~2.3|3.0.*",
-        "twig/twig": "~1.8|~2.0",
+        "twig/twig": "~1.28|~2.0",
         "doctrine/dbal": "~2.2",
         "swiftmailer/swiftmailer": "~5",
         "monolog/monolog": "^1.4.1"

tests/Silex/Tests/Provider/TwigServiceProviderTest.php

@@ -76,10 +76,10 @@ class TwigServiceProviderTest extends \PHPUnit_Framework_TestCase
             'twig.templates' => array('foo' => 'foo'),
         ));
         $loader = $this->getMockBuilder('\Twig_LoaderInterface')->getMock();
-        $loader->expects($this->never())->method('getSource');
+        $loader->expects($this->never())->method('getSourceContext');
         $app['twig.loader.filesystem'] = $app->share(function ($app) use ($loader) {
             return $loader;
         });
-        $this->assertEquals('foo', $app['twig.loader']->getSource('foo'));
+        $this->assertEquals('foo', $app['twig.loader']->getSourceContext('foo')->getCode());
     }
 }