Fix all skipped tests on Travis Windows builds by preserving newlines

[micahellison]

We've been having trouble with Windows tests on Travis for a while, but I noticed some of them were passing on my local Windows machine today. Turns out I had the dreaded autocrlf setting set to false on my machine, whereas it defaults to true on Travis.

This PR tells Travis to keep the setting false, which prevents it from changing newlines when it checks out files. It also removes all the skip_win directives that were used to skip tests that were failing on Windows due to this issue.

Checklist

• The code change is tested and works locally.
• Tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
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• [n/a] Have you written new tests for your core changes, as applicable?

[wren]

This is just so beautiful. 😭

Thank you!

[lock]

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