v0.2.0

Major changes from v0.1.0:

• The gRPC interface of acond has been replaced with a new Restful API interface.
• Traffics between acond and any clients (including aconcli) are encrypted using TLS.
• OpenID authentication support has been added.
  • acond accepts an OpenID user ID (e.g., an email address) passed via a kernel command line parameter at startup.
  • aconcli takes the client ID through an environment variable, and offers a new login command to allow the user to authenticate to acond.
  • Currently, only Google sign-in is supported. More authentication providers may be added in future.
  • OpenID authentication is optional, and can be disabled simply by not specifying a user ID when starting acond.

Note: This is a non-production release.