roadmap 0.6.1

model a project roadmap as a directed acyclic graph
Documentation
goal:
  label: |
    This is the end goal:
    if we reach here, there
    is nothing more to be
    done in the project
  depends:
  - finished
  - blocked

finished:
  status: finished
  label: |
    This task is finished;
    the arrow indicates what
    follows this task (unless
    it's blocked)

ready:
  label: |
    This task is ready 
    to be done: it is not
    blocked by anything

next:
  status: next
  label: |
    This task is chosen 
    to be done next

blocked:
  label: |
    This task is blocked
    and can't be done until
    something happens
  depends:
  - ready
  - next