[Form] Allow setting custom message, adapt to sf2.1 API #188
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This PR allows setting the message by using 'message' option.
It contains also a refactoring to adapt the code to recent Symfony forms API changes (removes dependency on deprecated functions).
It fixes #160.
The PR should be safe to merge into 1.1 and 2.0 (do you want me to make a separate PR?).
Also note that the namespace is not conform with Symfony2 namespaces (should be Constraint rather than Constraints) but I didn't touch it to avoid BC breaks.