Added explicit storage of DropletDir
renamed cloudfoundryDropletDir to dropletDir
Clarify parser tests for running and building
Parser capable of creating a Dockerfile for runtime
Equip Dockerfile parser to deal with empty env vars
Change test start command and script to be more realistic
Build a runtime image from a Dockerfile
Added Docker image building functionality to API
Fmt
Added image build to CLI
Stage before we build an image
Changed Godep usage to capture dependencies + moved godep to base of project