`keybase sign` and https://keybase.io/sign differ

When I use https://keybase.io/sign, the result is something like this:

```
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

This is something. It should be signed.
-----BEGIN PGP SIGNATURE-----
Version: Keybase OpenPGP JS 0.0.1
Comment: https://keybase.io/crypto
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=MKmL
-----END PGP SIGNATURE-----
```

When I use `keybase sign -m "This is something. It should be signed."`, the result is something like this:

```
-----BEGIN PGP MESSAGE-----
Version: GnuPG/MacGPG2 v2.0.22 (Darwin)
Comment: GPGTools - https://gpgtools.org
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=zzal
-----END PGP MESSAGE-----
```

The former can be copy/pasted into an email client, and recipients can view the contents immediately, and optionally verify.

The second seems to require that the recipient use a verify function before seeing the contents.

Why the difference? Are these commands supposed to be analogous? Can one be updated to match the other?

Start by comparing the output of `keybase sign -m` with the output from https://keybase.io/sign, focusing on the OpenPGP message types shown in the examples. Determine whether the CLI should produce a cleartext signed message that email clients can display, and verify the result with the relevant signing and verification commands.

Written by the indexing model from the issue text.