Add debounce to watch tasks to workaround vim save
Add debounce to watch tasks to workaround vim save

Vim, configured to backup files, will trigger multiple saves and confuse
the watch tasks, causing silent errors and making the watcher not work anymore.
Adding a debounce to the watcher solves this problem.

refs:
http://stackoverflow.com/questions/27782476/vim-is-triggering-multiple-saves
https://github.com/remy/nodemon/issues/349

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