Initial addition of fileserver event

This event is intended to "notify" salt that there are changes to the underlying fileserver module. This can be used to (for example) trigger a module sync within the reactor system-- but really you can do whatever you want with it.
Rename events to match namespacing standards
Merge branch 'develop' of github.com:saltstack/salt into develop

Conflicts:
	salt/fileserver/gitfs.py
Merge pull request #6927 from jacksontj/develop

Initial addition of fileserver event