int, int64, etc do not work

[njmurarka]

Great library!

But if I have a method that takes in a SIGNED integer of some kind, when I call that method, I get an error. I have verified these methods work fine in geth.

Here is the error:

NameError: undefined local variable or method `uint' for #Ethereum::Formatter:0x007fb913c7fc58

Not sure why that's the error message but I narrowed it down to only happening when I refer to signed int's in the call interface for a method.