Feature request: remove extensions from path

Since `send` is able to handle finding files when the extensions don't exist in the path, would it be possible to expand the redirect functionality here to remove extensions?

For instance, these redirects would take place:

| from | to |
| --- | --- |
| /login.html | /login |
| /something/index.html | /something/ |

I think this would only happen if the `extensions` option is already populated with the extensions for `send` to look for.