Removed unused file, fixed some file permission

Updated Servo library version

Servo library for the SAMD architecture.

Due to website configuration changes, every url starting with http://…

…arduino.cc has been changed to http://www.arduino.cc. Fixes #3191

Libraries: added help files to mitigate missing contextual reference …

…issue

Audio and Servo library version bump

Libraries: version now compliant with semver. See http://semver.org/