Define prettify via options

[vdh]

The need to override validate.prettify globally is a burden for functional programming, so I added the ability to provide it via the validate/runValidations options.

Just in case anyone might need further customisation, I also made it possible to override prettify for individual numericality and equality validations via the validator options.

[coveralls]

Coverage remained the same at 100.0% when pulling 6f6d776 on vdh:prettify-via-options into f42d0ac on ansman:master.

[coveralls]

Coverage remained the same at 100.0% when pulling 856d70e on vdh:prettify-via-options into ab5ad5a on ansman:master.

[coveralls]

Coverage remained the same at 100.0% when pulling f23082e on vdh:prettify-via-options into ab5ad5a on ansman:master.

[ansman]

Sorry for the delay, looks good. Thanks!

[underscore05]

Can you please create an example on how to use this using presence?

[vdh]

@underscore05 The presence validator already has the option to set a custom message, I don't understand how you're relating that validator to this.

This feature allows a custom prettify function within the options of the validate call, instead of being restricted to just the global validate.prettify.

prettify handles things like attribute names, as describled here in the docs.

For example:

return validate(values, constraints, {
  prettify: function prettify(string) {
    // Do something special with `string`, like i18n
    // Otherwise, fall back to the global…
    return validate.prettify(string);
  },
});