v1.2.0

  - [BC Break] Added `priorityEnabled` option (default true). Only show highest
    priority failing validator error message. Validator structure altered in order
    to manage priority
  - [BC Break] added custom DOM-API `parsley-`. Previous data-API is dropped.
      - Now to validate a form, use `parsley-validate`
      - Now to add a validator, use `parsley-<validator>`
  - [BC Break] `onFormSubmit` is now called `onFormValidate`