wrap wiringPiISRStop() in driver API

[2bndy5]

I think I found the equivalent to detachInterrupt() in wiringPi lib. Its not documented, but wiringPiISRStop() is used in wiringPi lib's examples/tests.

[2bndy5]

I'm not very adamant about testing this.

1. the IRQ_PIN value in examples_linux/interruptConfigure.cpp doesn't work with wiringPi:

   gpio: Unable to open GPIO direction interface for pin 24: No such file or directory
   wiringPiISR: unable to open /sys/class/gpio/gpio24/value: No such file or directory
   

2. detachInterrupt() isn't used anywhere in the examples. Instead we rely on destructors for cleanup because most examples_linux/**.cpp are designed to be exited with Ctrl+C.