Hi guys!

Related tohttps://github.com/symfony/symfony/blob/master/UPGRADE-2.5.md#validator andhttps://github.com/symfony/symfony/blob/master/UPGRADE-3.0.md#validator - specifically, I'm talking about the new Validator API and options.

Needed changes:

• A) Update theExecutionContextInterface namespaces (seeUpdate Callback.rst #4161 and2.5 Validation API changes #4233)
• B) Update theaddViolationAt tobuildViolation
• C) Add a cookbook entry to explain all of this stuff, and show how a bundle can support both versions
• D) Update the framework reference section with theframework.validation.api option.
• E) Replace usages of deprecated methodvalidateValue() where needed.
• F) Change signature of using->validate with a group argument: