updated Symfony to 2.3
Remove a deprecated call to bindRequest()
updated deps
merged branch damienalexandre/patch-1 (PR #515)

This PR was merged into the master branch.

Discussion
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Remove a deprecated call to bindRequest()

Quick fix to replace `bindRequest()` to  `bind()` in the `DemoController.php` exemple.

Commits
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f13e422 Remove a deprecated call to bindRequest()