Fix authCodeGrant bug.

Make the request redirectUri as the client's redirectUri.
This is correct when client.redirectUri is an Array type.
Update authCodeGrant.js

Move `client.redirectUri = self.redirectUri;` inside the block where it checks for an array (e.g. line 117) and also remove the comment.
Merge pull request #84 from stanzhai/master

Bug: Explicitly set redirect_uri when client has multiple redirect_uri's