[bv-dev] Two improvements related to exceptions

Hi, To take a break from the value extraction business, I've been working on two small improvements related to the exception model: * BVAL-559 [1]: This adds a new subtype of ValidationException, NoProviderFoundException. This allows integrators to distinguish between the case where no BV provider is around at all and the case where a provider is there but fails to bootstrap (e.g. due to misconfiguration in validation.xml). The use case for this is better support for JPA's validation-mode "auto". * BVAL-264 [2]: More useful exception message if a ConstraintViolationException has been constructed from a set of violations The API and spec changes can be found at [3] and [4], respectively. Please speak up if you have any remarks. If nothing comes up, I'll merge both PRs mid next week. Thanks for any feedback, --Gunnar [1] https://hibernate.atlassian.net/projects/BVAL/issues/BVAL-559 [2] https://hibernate.atlassian.net/projects/BVAL/issues/BVAL-264 [3] https://github.com/beanvalidation/beanvalidation-api/pull/82 [4] https://github.com/beanvalidation/beanvalidation-spec/pull/133