added trusted hosts check
Merge branch '2.0' into 2.1

* 2.0:
  added trusted hosts check

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
	src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
	src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
Merge branch '2.1' into 2.2

* 2.1:
  added trusted hosts check

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
	src/Symfony/Component/HttpFoundation/Request.php
Merge branch '2.2' into 2.3

* 2.2:
  added trusted hosts check

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php