Log Message:
Update to 0.9.4. Changes:
- Some useful API addition.
- Much improved, verbose error reporting.
- Cleaned up TLS handling, various bugfix.
- In case an error occur when verifying the peer certificate,
  notify the peer about the failure.

The Prelude Library is the glue that binds all aspects of Prelude
together. It is a library which enables Prelude components to
communicate with the Prelude Manager. It also makes it easy for third
party software to be made 'Prelude Aware' (able to communicate with
Prelude components). It provide common, useful features used by every
sensor.