Merge pull request #45 from xthiago/master

Added translation to brazilian portuguese (pt_BR)
changed listings of events to match the order they are dispatched
removed useless code from a test form
added another test
added another test
let Travis run tests with PHP 5.3.3, 5.3, and 5.5 as well
removed argument for DOMDocument::saveHTML() to be compatible with PHP < 5.3.6
updated changelog
use the service name `session.storage.mock_file` instead of its alias, refs symfony/symfony@146a502a0e3527f6ffbda14ce06477b9b2a01232
removed e-mail address from travis config to use defaults, let it always send an e-mail
Add getStorage() method

Access storage to add other data.
Merge pull request #48 from Abhoryo/patch-1

Add public getStorage() method
added phpdoc comment for previous commit
fixed a phpdoc comment
advise using stable versions
made the dependency on an event dispatcher optional
fixed the previous commit for keeping BC
redesign steps
added method `getStorage` to `FormFlowInterface`
updated a sentence about validation groups