support for afero.Fs filesystem abstraction#99

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progrium wants to merge 2 commits intoradovskyb:masterfrom

progrium:master

Commits on Apr 3, 2020

made watcher work against afero.Fs abstraction and added SetFileSystem()
progrium
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replacing filepath.Abs with filepath.Clean since using afero.Fs means no meaningful working directory
progrium
committed