Allow double quote charactere in JSON value.
Merge branch 'Spy-Seth-fix/allow-double-quote-in-json-context' into behat-2.x
There is still people which uses behat2. :)
Merge branch 'stephpy-patch-1' into behat-2.x
headers are no more stored on client, because client does not flush them when reset/restart session. They are on Behat\Mink\Driver\BrowserKitDriver and there is no way to get them.
Fix ability to test json payload against json schema

Conflicts:
	src/Context/JsonContext.php
Fix step  `the JSON node "Item[10]" should not exist` when node is an array
Add new JSONContext step validating JSON node against schema
the JSON node "(?P<node>[^"]*)" should be valid according to the schema "(?P<filename>[^"]*)"
Fix json schema validation
Merge improve json context