- chown removed
- based on tar.gz instead of deb pkg
- volumes for logs and config removed
- gosu removed

Related to #141

We don't write logs to disk by default,
but for user that wish to do so it needs
to be possible.

* master:
  Fix permissions problem #141

Adds functionality to easily pre-bake with custom plugins.

- cleanup of mkdir
- oneliner for downloading and extracting Grafana
- envs moved from run.sh to Dockerfile

Users should create their own volumes
when they need to.

* origin/master:
  make a target docker repo an optional param
  Only pushes to the latest tag for releases.
  Add workdir to dockerfile

* master:
  Pass "$@" to grafana-server before 'cfg:' options