Re-enabling timer 2 pwm after tone() ends.   Factored out common code to disable timers.
Re-enabling timer 2 pwm after tone() ends.  
Factored out common code to disable timers.

AdrianIONICA/arduino,AdrianIONICA/arduino,dmays/google-code-arduino,rjaa-b/arduino,dmays/google-code-arduino,AhmedMedo/arduino,jdecked/arduino,AdrianIONICA/arduino,dmays/google-code-arduino,andyvand/arduino,dmays/google-code-arduino,ezierayvanne/arduino,AhmedMedo/arduino,dmays/google-code-arduino,ezierayvanne/arduino,andyvand/arduino,AdrianIONICA/arduino,smarques7/arduino,jdecked/arduino,rjaa-b/arduino,dmays/google-code-arduino,smarques7/arduino,jdecked/arduino,AhmedMedo/arduino,smarques7/arduino,smarques7/arduino,smarques7/arduino,AhmedMedo/arduino,ezierayvanne/arduino,ezierayvanne/arduino,AhmedMedo/arduino,ezierayvanne/arduino,andyvand/arduino,AdrianIONICA/arduino,andyvand/arduino,rjaa-b/arduino,andyvand/arduino,jdecked/arduino,AdrianIONICA/arduino,jdecked/arduino,smarques7/arduino,rjaa-b/arduino,ezierayvanne/arduino,rjaa-b/arduino,rjaa-b/arduino,andyvand/arduino,jdecked/arduino,AhmedMedo/arduino