Additional filters

[nathany]

I would like to implement filters like these in a separate utility package:

• shell pattern matches, such as *.go
• excluding hidden files and directories (.git, .hg)
• throwing out duplicate events on a file (occurring within a second)

(My attempt to incorporate them into fsnotify itself is here: howeyc/fsnotify#65)

[omeid]

This would be really amazing, and preferably something that is compatible with filepath.Glob, however, it does not support exclusion but it is easy to add glob exclusion.