#5 Invalid links in README

[Niels Basjes]

The README contains two links essential to getting this running:
It says:
"Also: install Streaming.h, PString.h from arduiana.org, and Time.h from arduino.cc/libraries"
Both these urls result in an error of non existance.

As far as I can tell
- arduiana.org should be arduiniana.org
- arduino.cc/libraries should be http://arduino.cc/playground/Code/Time