Timer1 Auto-magic time setup

Timer1 now determines the best way to setup its own prescaler and period
register.
Timer2 Auto-magic time setup

Timer 2 now determines the best way to setup its own prescalar,
postscalar and period registers.
Timer4 Auto-Magic time setup

Timer4 now determines the best way to setup its own prescaler,
postscaler, and period registers.
Timer3 Auto-Magic time setup

Timer3 now determines the best way to setup its own prescalar.
Merge pull request #2 from CraigComberbach/Timers

Timers