Added optional request object in validateFunc

[ck-lee]

My first PR & contribution to hapijs. Let me know if this works. Otherwise, I'm happy to make further changes to make it right...

closes #30

[hueniverse]

Can't rely on number of arguments in a callback function. People can (and often do) implement functions in all sorts of ways in JS including using arguments instead of actual arguments, or add extra arguments so that a method can be shared between multiple APIs.

This needs to be a breaking change the same way it was done in hapi-auth-cookie.

[ck-lee]

Looking into the the code for hapi-auth-cookie. https://github.com/hapijs/hapi-auth-cookie/blob/master/lib/index.js#L133-150

Let me know if you would like to implement this change for next release and what other things to watch out for. I'm quite happy to do it.

[hueniverse]

Basically just add request as the first argument passed to the callback along with some new tests to confirm it is there. I will then publish a new major version. Pretty simple.

[lock]

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