Update 3-listener-support.md

Fixed a typo in QueryParam annotation example:
array="true" => array=true
Merge pull request #567 from net02/patch-1

Update 3-listener-support.md
FlattenException from the HttpKernel is deprecated, removed type hint and manually checking the exception type
updated UPGRADING.md
Merge pull request #565 from odino/master

FlattenException incompatibility with Sf2.3
allow failures on dev-master
fixed phpunit bug
Merge pull request #569 from liuggio/patch-1

fixed phpunit bug
fix tests
fix tests
fix tests