WIP on new pwm write with freq and pulseWidth control.
Fix the range validation.
Remove unnecessary returns.
Added missing opts param to led and motor drivers,
Updated servo and motor.
Remove unnecessary opts validation.
Fix test for servo, led and motor with new pwm approach.
Added direct-pin example.
Move pwmScale calc to driver and also make it available for user to define it.
Merge development and resolve conflicts
Fix tests for new pwm writes.
Fix failing spec
Remove accidentally added file.
Merge pull request #24 from hybridgroup/pwm-write-upd

Pwm write upd