Update ROADMAP.md based on 10/21/2014 DGAB meeting

The Docker Governance Advisory Board (DGAB) met for the first time Tue 10/21/2014.
Among other topics, the DGAB reviewed and refreshed the Docker Project Statement of Direction.

(Sven added from the Pull Req #9055)
Docker-DCO-1.1-Signed-off-by: Scott Johnston <scott.johnston@docker.com> (github: j0hnst0n)

Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>
Merge pull request #9079 from SvenDowideit/pr_out_update_roadmap_md_based_on_10_21_2014_dgab_meeting

Update ROADMAP.md based on 10/21/2014 DGAB meeting