Added getFrequency(), getPeriod(), and protected var to store those values
Merge branch 'enchancements' of https://github.com/ivanseidel/DueTimer into enchancements

Conflicts:
	DueTimer/DueTimer.h
Merge branch 'enchancements' of https://github.com/ivanseidel/DueTimer into enchancements

Conflicts:
	DueTimer/DueTimer.h
Merge branch 'enchancements' of https://github.com/ivanseidel/DueTimer into enchancements

Conflicts:
	DueTimer/DueTimer.cpp