CIRCLE / django-sshkey

Also add ability to send HTML emails.

SSHKEY_FROM_EMAIL defaults to DEFAULT_FROM_EMAIL

This requires a South migration to label 0002

Putty and some commercial SSH implementations use the RFC4716 format, or SSH2
compatible public key format, for their public keys instead of the OpenSSH
public key format.

This change allows RFC4716 public keys to be entered into the key field.  The
key will be translated to OpenSSH format before being stored.

Move sshkey_fingerprint from models.py to util.py. util.py cannot import from
models.py without Django complaining about DJANGO_SETTINGS_MODULE; this is
required by the scripts. The reverse can happen fine though.

Keys with more than one line of text create invalid authorized_keys
output.