Mike

Bug fixes
- Selectively require `enum34` in a Wheel-compatible way

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Bug fixes
- Include `templates/index.html` in source dists (fixes `mike set-default`)

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Bug fixes
- Add support for Python 3.7 as well as newer versions of `ruamel.yaml`

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Bug fixes
- Support defining theme in `mkdocs.yml` as a mapping instead of just a string

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Bug fixes
- Fix version selection on real Github pages
- Allow re-specifying aliases if they're already set for a version

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New features
- Add an `alias` command to copy an existing set of docs to a new alias

Breaking changes
- Change the name of the `rename` command to `retitle`

Bug fixes
- Fix handling of remotes so that local changes aren't wiped out
- Rework aliasing to be persistent across deployments

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