0.0.4

• The state directory (which is used to make sure that interupted tasks can be
  safely resumed) is now configurable. This means it is now safe to run
  multiple fuselage deployments in parallel (where it makes sense to do so).
  It's now also possible to run fuselage as a normal user (@mitchellrj).
• The fuselage runner can be told to not raise an exception if no changes were
  made (@mitchellrj).
• Shell commands can now be told to ignore failure cases (@mitchellrj).
• Further python 3 support fixes (@mitchellrj).