Arduino1.0

Renamed *.pde to *.ino

Both wwvb_clock and the signal simulator had a struct called "wwvbBuffer" that the compiler would complain about if the files were in the same folder.

Arduino IDE would ask every time if the user wanted to move the files into a folder with the same name. 

These changes make it only compatible with Arduino 1.0 + (Tested on 1.0.3)
Recommend creating a branch for legacy Arduino 023 and a branch for Arduino 1.0