Modified Dockerfile for issue 285
Changed ubuntu image to latest to match other hanlon containers
Changed CMD to include new changes in hanlon_init
Merge pull request #286 from jcpowermac/tb/update-docker-285

Modified Dockerfile for issue 285
Refactors slice class (so that the ProjectHanlon::Stack class is a standalone class)
Merge pull request #287 from tjmcs/tb/refactor-slice-class

Thank you!

Fixes #284 (Refactor Slice class to separate out Stack class)