WIP on new servo implementation.
Fix typos and issues with pwm-pin and beaglebone adaptor.
WIP on servo, remove connect logic from adaptor.
Check if the pwm pin has already been exposed and validate callback.
Fix scope issue with dutyPath call.
Remove unnecessary returns.
Fixes issues with servo write and new servo implementation.
WIP on servos and pwm write.
WIP on pwm pin refactor.
Remove connect from write and remove callbacks from connect, pwmpin slot register too fast, OS does not have time to create pwm GPIO folder structure before trying to write to the file.
Fix scope of  in pwm-pin#connect.
Add retry count for pwm.period file not found err.
Separate writeDuty and writePeriod into their own functions.
Merge branch 'servo-level-up' of github.com:hybridgroup/cylon-beaglebone into servo-level-up
Removed error handling for pwm directory tree not found to the pwm-pin lib instead of doing it in the adaptor.
Fix typo in error handling for pwm write.
Fix default freq in adaptor.
Move angle and pwmScale calculation to the driver.
Removes pwmScale from adaptor completely and fixes issues with servo call params.
Remove independent duty and period writes and consolidate in one function. Add line break after period write.