release 9.1-1
readme: use tagged images in docker commands
readme: added "Contributing" section
dockerfile: upgrade to sameersbn/ubuntu:14.04.20141026 base image
readme: specify image version in administrative login command
Update README.md
Merge pull request #9 from flecno/patch-1

Update README.md
Merge pull request #1 from sameersbn/master

Update fork with source repository