New file-system watch

Features

This release introduces a new file-system watcher implementation option #775 created by Facebook called watchman - hopes are it is faster, consumes less CPU and is more stable.

See in the docs under the Caution box on how to enable the opt-in feature.

Thank you to https://github.com/d4rky-pl for implementing a bridge for docker sync!

Other changes

• Fix test specs #778 - thank you https://github.com/cfurrow