Make joi optional for route validation

[hueniverse]

Allow other validation modules, but default to joi.

[Marsup]

Should it also support the describe interface ? Would make things a lot easier for lout 😃

[hueniverse]

Lout should now check if it can get validation description just in case.

[Marsup]

Wouldn't it make sense to allow people to document their custom validation this way ? They could at least provide description, notes, ...

[hueniverse]

But we're not going to make that a required interface, especially since hapi itself isn't using it.