0.4.0-pre1

Goto v0.4.0

This is a major change due to the way we handle releases.
There are now a separate frontend and backend, the frontend
is responsible for downloading erts and libraries.
Backend may be run on it's own for headless systems and for
such we MAY provide erts for simplicity.

0.3.0 Pre-RC

Pre-release for 0.3.0