Fixed decoding of 64 bit integers
Fixed decoding of 64 bit integers

It seems that Integer in V8 is limited, on 32 bit version of Node.js, to a 32 bit integer.
With node 0.8.*, an integer overflow occurs when trying to read uint64 types from DBus.

Number, on the other hand, does not seem to have a limit.

I am not sure if this bug would also exist for encoding values, since IntegerValue() is used
there, again for 64 bit integers. 
Shouqun/node-dbus,Shouqun/node-dbus,Shouqun/node-dbus