EdDSA:

- Add hashCode() and equals() everywhere it was missing,
  so we can test keys for equality: Curve, EdDSAParameterSpec, EdDSAPrivateKey, and EdDSAPublicKey
- Speedup for GroupElement.equals()
- Fix public key decode()
- Put unknown class name in exceptions
- indent fixes
Provider:
- Add KeyFactory aliases required for cert.verify()
- Fix EdDSA signature OID
SelfSigned:
- Add simple tests after generation using cert.verify() and key equality