Prior to this commit, due to a fix that ignored `.vagrant` with rsync helper, it broke the ability to watch for changes in subdirectories when running the rsync-auto command. This commit puts back some of the helper methods that were there previously for a given watcher path to ensure that all files and subdirectories are properly watched and synced.
Vagrant Core Plugins
These are plugins that ship with Vagrant. Vagrant core uses its own plugin system to power a lot of the core pieces that ship with Vagrant. Each plugin will have its own README which explains its specific role.