Added duty setting.
Rewritten PWM using timer.
Rewritten repulsor blast function.
Rewritten timer driver SW PWM.
Removed unwanted blink before/after fade in/out.
Do not try open/close if already open/closed.
Fix compilation error.
Added INTENSITY command.
Merge pull request #7 from rmoravcik/sw_pwm_rewrite

Rewrite of SW PWM