wix/accord — pull request #9 by holograph (2014-02-23 13:28:18+00:00)
Title: (BREAKING CHANGE) Complete rewrite of the description framework. 

The description framework has been completely rewritten to be a bit more sound; this is a breaking change, where the following APIs have been affected:
* `Violation.description` is now *optional*.
* While validators are expected to be defined via the `com.wix.accord.dsl.validator[T]` macro, this is not mandatory; consequently there's no way to guarantee that a description is generated prior to execution.
* If your code decomposes the actual violations, you'll need to take this into account. The syntax for test helpers (`failWith` etc.) remains the same.
* The surface area of `Validator[T]` has been drastically reduced.
* Most convenience functionality has been shunted to the `BaseValidator[T]` trait, which is what implementors should be deriving from.
* A convenience DSL is provided by this trait (provided by the mixed-in `ViolationBuilder) to simplify violation construction.