fix npe

[rdeshpande]

hey, just added a quick bugfix to check that module is defined - using this lib in a browser was throwing an error.

[mjb2010]

I prefer to idiot-proof it, in case module is something like null:

try { module.exports = URI; } catch(ex) {}

...but maybe that's overkill?

[rdeshpande]

Sure, that should work, but in node it seems to be okay either way?

foo
ReferenceError: foo is not defined
at [object Context]:1:1
at Interface. (repl.js:171:22)
at Interface.emit (events.js:64:17)
at Interface._onLine (readline.js:153:10)
at Interface._line (readline.js:408:8)
at Interface._ttyWrite (readline.js:585:14)
at ReadStream. (readline.js:73:12)
at ReadStream.emit (events.js:81:20)
at ReadStream._emitKey (tty_posix.js:307:10)
at ReadStream.onData (tty_posix.js:70:12)
typeof(foo)
'undefined'