Replace ironclad with babel and sha1

[naryl]

Ironclad is a huge library with huge building problems on ECL. websocket-driver only uses it for two functions. One of them is available from babel which is already included through fast-http, the other one is sha1 hash. There's a library in quicklisp for it but there's a collision with another base64 package.

I've made a PR to the sha1 library ( https://github.com/massung/sha1 ) to use cl-base64 too. You can accept this PR right after my sha1 PR is accepted.

[naryl]

The CI fails because the other PR is not accepted yet.

[fukamachi]

LGTM. Thank you for your contribution. I'm waiting for the other PR is merged.

[naryl]

sha1's developer refused to change dependency. I'm investigating other options.

[samuel-hunter]

I was able to change sha1 remove the base64 dependency altogether. I made a PR #58 which incorporates these changes.