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WHAT is this pull request doing?
This fixes #931
Followers will be using MFiles. It will keep track on last access time for a file and close it when it's been unused for at least 10 seconds (this can be discussed). Files are only closed when a new one is opened, meaning that a lot of files may stay open for a good period of time.
HOW can this pull request be tested?
Run specs (still passes). Should probably add specs to verify that files are closed and unmapped.