0.3.12

- fixed null reference for recipe.ingredients #2

0.3.9

    - added electric poles    
    - added arithmetic, decider and constant combinator
    - added red & green wire

0.3.8

    - find rocket parts by recipe
    - find nuclear fuel and burn result by fuel category

0.3.7

  Features:
    - barrels updated to changes in 0.16.8
    - increased default barreling recipes to more ups friendly 10 barrels/2s
  Removed:
    - fluid wagon tweaks