implement cmd `auto` on Windows about doit HOT 3 OPEN

Hi @schettino72 !
Today I found another one use case for doit on my work but I need the support for auto command on Windows for that use case. #101 looks abandoned:

There are too many issues with tests. I will not merge this branch in the current situation...

Another thing that makes me think twice is the state of watchdog,
the project is not really actively maintained and they themselves do not run their test suite on OS X nor Windows. I am afraid merging this will be a step backwards.

I think I could invest some time in resolving this issue but before that I want to know do you have some new thoughts about it because the last comment was more than two months before.

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@Hinidu as far as I know it actually works. So you can use this branch. And since doit has plugin support you could even package this and put on pypi as a separate package...

For merging it into doit core it is a bit harder because I have very high quality standards. Even with all tests passing on a CI I might not merge it because of concerns with watchdog...
but this should not stop you in any way. Any problem you can ask for help and if you decide to package it on pypi we can add references to it in the documentation.

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git is now using watchman (https://github.com/facebook/watchman)

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