ctz / rustls / 347

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travis-ci

Refactor sign::Signer

We now have these traits:
- sign::SigningKey: a contain for a signing key.  You can get
  the key type, and have it choose a signature scheme from
  those offered.  That choice is expressed in the form of a:
- sign::Signer: can produce signatures with a fixed scheme.

This removes any possiblity of calling `sign()` with an
unsupported scheme.

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