Merge branch '2.7' into 2.8

* 2.7:
  respect the umask argument in dumpFile()
  dumpFile(), preserve existing file permissions
  Add validate method to mockec validator in form TypeTestCase
  bumped Symfony version to 2.7.26
  updated VERSION for 2.7.25
  update CONTRIBUTORS for 2.7.25
  updated CHANGELOG for 2.7.25
  [HttpKernel] fixed Kernel name when stored in a directory starting with a number
  context listener: hardening user provider handling

Author: fabpot

Tests/Extension/Validator/Type/TypeTestCase.php

@@ -23,6 +23,7 @@ protected function setUp()
         $this->validator = $this->getMockBuilder('Symfony\Component\Validator\Validator\ValidatorInterface')->getMock();
         $metadata = $this->getMockBuilder('Symfony\Component\Validator\Mapping\ClassMetadata')->disableOriginalConstructor()->getMock();
         $this->validator->expects($this->once())->method('getMetadataFor')->will($this->returnValue($metadata));
+        $this->validator->expects($this->any())->method('validate')->will($this->returnValue(array()));
 
         parent::setUp();
     }