Issue title: Express 3.x.x support?
 Issue body: Hey,

great work! Is this working properly with Express 3.x.x?

I'm asking because it shows me a "CANNOT GET /dialog/authorize" in my Express 3.1.0 project. I also tried a Express 2.0 project which runs perfectly fine.

Probably issues with my routes!?

Thanks!

 Comments: 
 Comment 0: Yes, I've been running it successfully under Express 3.  I'd double check your setup.  Reopen this if you pinpoint a specific bug with oauth2orize.

 Comment 1: Hi again, thanks for your fast response! I double checked my setup and read some other issues. I stumbled upon issue #7 and found out that this (client parameter) was causing my problem. I fixed this by using "cli" instead of "client".

Thanks!

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