- Re-evaluate feature set and REST API.
- switch duration units to days, which are more meaningful than sticking to
  ISO units in this context.
- Implement the "cau" half of "caucase".
  As a consequence flask password authentication mechanism is not needed
  anymore. As HTML UI is not required internally to caucase, and as
  sqlalchemy is not used to its full extend, get rid of these
  dependencies altogether.
- Implement REST HTTP/HTTPS stand-alone server as a layer above WSGI
  application, and integrate HTTPS certificate issuance and renewal
  mechanism to simplify deployment: no middleware needed, so from
  gunicorn dependency.
- Use standard python modules for http client needs.
- Re-evaluate data retention options:
  - unsigned CSRs are kept forever
  - CRTs are stored in CSR table, and a 24 hour expiration is set
  - CA CRTs: (unchanged, expire when past validity period)
  - CRLs: (unchanged, expire when past validity period)
- Redispatch housekeeping tasks:
  - CA renewal happens when caucase is used and renewal is needed
  - CRL is flushed when re-generated
  - CSR table (containing CRTs) is cleaned when a new CSR is received
  removing completely the need for these special periodic tasks.
- Storage parameters are not stored persistently anymore, instead their
  effect (time offsets) is applied before storing (to protect against
  transient retention period reconfiguration from wiping data).
- Rework storage schema.
- Implement certificate extension propagation & filtering.
- Implement "Certificate was auto-signed" extension.
- More docstrings.
- Use a CSR as a subject & extensions template instead of only allowing
  to override the subject. Useful when renewing a certificate and when
  authenticated client wants to force (ex) a CommonName in the subject.
- Reorganise cli executable arguments to have more possible actions.
  Especially, make CA renewal systematic on command start (helps
  validating caucase URL).
- Increase the amount of sanity checks against user-provided data (ex:
  do not upload a private key which would be in the same file as the CRT
  to renew).
- Extend package classifiers.
- Get rid of revocation reason, as it seems unlikely to be filled, and
  even less likely to be read later.
- (almost) stop using pyOpenSSL. Use cryptography module instead.
  cryptography has many more features than pyOpenSSL (except for certificate
  validation, sadly), so use it. It completely removes the need to poke
  at ASN.1 ourselves, which significantly simplifies utils module, and
  certificate signature. Code is a bit more verbose when signing, but much
  simpler than before.
- add the possibility to revoke by certificate serial
- update gitignore
- include coverage configuration
- include pylint configuration
- integrate several secondary command:
  - caucase-probe to quickly check server presence and basic
    functionality, so automated deployments can easily auto-check
  - caucase-monitor to automate key initial request and renewal
  - caucase-rerequest to allow full flexibility over certificate request
    content without ever transfering private keys
- add a secure backup generation mechanism
- add a README describing the design