Big update here.

delayMicrosecondsHard re-written - again.
Added a serialRead example program, and added in the okLed
to the examples too.
Updated/checked some of the GPIO/PWM code.
Added in some experimental servo and tone generating code and
and example or 2.
Tweaks to the gpio command to correctly load the I2C modules too.

wiringPi/wiringPiSPI.c

@@ -52,7 +52,7 @@ static int         spiFds [2] ;
 
 int wiringPiSPIGetFd (int channel)
 {
-  return spiFds [channel &1] ;
+  return spiFds [channel & 1] ;
 }