Use strstr instead of strpos

* 2.1:
  bumped Symfony version to 2.1.11-DEV
  updated VERSION for 2.1.10
  update CONTRIBUTORS for 2.1.10
  updated CHANGELOG for 2.1.10
  fixed CS
  [Process] Cleanup tests & prevent assertion that kills randomly Travis-CI
  [Filesystem] Fix regression introduced in 10dea948

Conflicts:
	src/Symfony/Component/Form/Extension/Core/DataTransformer/DataTransformerChain.php
	src/Symfony/Component/HttpKernel/Kernel.php
	src/Symfony/Component/HttpKernel/Profiler/RedisProfilerStorage.php
	src/Symfony/Component/Routing/Tests/Loader/XmlFileLoaderTest.php

ClassLoader.php

@@ -181,7 +181,7 @@ class ClassLoader
         $classPath .= str_replace('_', DIRECTORY_SEPARATOR, $className) . '.php';
 
         foreach ($this->prefixes as $prefix => $dirs) {
-            if (0 === strpos($class, $prefix)) {
+            if ($class === strstr($class, $prefix)) {
                 foreach ($dirs as $dir) {
                     if (file_exists($dir . DIRECTORY_SEPARATOR . $classPath)) {
                         return $dir . DIRECTORY_SEPARATOR . $classPath;

Tests/DebugClassLoaderTest.php

@@ -42,6 +42,7 @@ class DebugClassLoaderTest extends \PHPUnit_Framework_TestCase
                 $reflProp->setAccessible(true);
 
                 $this->assertNotInstanceOf('Symfony\Component\ClassLoader\DebugClassLoader', $reflProp->getValue($function[0]));
+
                 return;
             }
         }