Up version for development
Add support for installing a specific Docker version

Closes GH-9
Update bundle
Improve checking for whether docker is installed
Tweaks to development vagrantfile
Update CHANGELOG
Support for container naming + clean up specs

Closes GH-11
Document support for installing a specific docker version
Support for exposing ports and volumes

Closes GH-13 and GH-10
Ensure bind mounts exists before creating a container with volumes [GH-13]
Support for linking

Closes GH-12
Document new features