Add how to configure ssh access into the container
Better logic to determine required Docker version

This commit adds support for both a minimum Docker version, and the
version currently recommended by Docker development team. If the user is
not running the minimum version, the script will not continue. User is
warned if they have any version prior to the currently recommended
version.
Merge pull request #40 from Stealthii/version-code

Better logic to determine required Docker version
Update launcher

0.11 is out
default is wrong here, we really need an ssh key, its critical
clarify language about SSH key generation
Merge pull request #25 from alexdong/patch-2

Add how to configure ssh access into the container
Revert "Add how to configure ssh access into the container"

This reverts commit 5c7d0d2768a1af29ad5372f1e364c9d23a455172.
UPDATE to Ruby 2.1.2
another version out today :)
Initial pass: use runit instead of runsvdir in container
Update image version to 0.2.1