updated composer.json
fixed typo
Fix deprecated function bind
merged branch agiuliano/master (PR #547)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #547).

Discussion
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Fix deprecated function

In AcmeDemoController/contactAction there was the deprecated function $form->bind() instead of $form->submit()

Commits
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b83f3ba Fix deprecated function bind
Merge pull request #14 from symfony/2.3

Merge symfony/standard with Lexance/symfony-multidomain [2.3]