bump docker to v0.9.0
make SSH key and host nodes dir available

The Vagrant provider requires an SSH key and the ability to read from a folder to get all nodes available in the cluster. Without it, it will fail to provision new nodes.
add empty host_nodes_dir
fix typo
Revert "add empty host_nodes_dir"

This reverts commit 99a43defd92f3f4cbab30a3a0a08c656622a11cc.
fix path issue
fix dop images function call
Merge pull request #662 from opdemand/fix-dop-images

LGTM.
Merge pull request #661 from opdemand/655-vagrant-nodes

make SSH key and host nodes dir available
Updated CHANGELOG.md.
Switch master to v0.7.0.
Standardize containers on WORKDIR /app
Standardize install of pip 1.5.4.
Clarify binding to $PORT with Dockerfiles
Restored deis data bags creation to provision script.
Merge pull request #665 from opdemand/664-vagrant-data-bags

Restored deis data bags creation to provision script.
Clarify 2-LGTM code approval policy.
Merge pull request #666 from opdemand/merge-approval

Clarify 2-LGTM code approval policy.
Adds friendly name in VirtualBox and Vagrant
Merge pull request #663 from opdemand/dockerfile-makefile-cleanup

Dockerfile cleanup