Change locale support to something that works with browserify.

[martinheidegger]

Right now its not possible to use join in the browser using browserify because it requires a dynamic string.

errors.js#L26

Browserify doesn't know how to resolve this and will throw a error like:

Uncaught Error: Cannot find module '/node_modules/joi/languages/en-us.json'

As cleanest option to resolve this I would see passing in the locales as object alternatively. Then I could setup my browser js by using something like:

joi.validate(object, rules, {localeData: require("joi/locales/en-us")});

What do you think?

[hueniverse]

Closed by #231

[lock]

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