Should fix crash with returning an array with a null string.
added new art from @Rosethorns for #13
Stabilized RecipePattern

Closes #18
Merge branch 'feature/Stabilize_RecipePattern' into develop
Create de_DE.lang
Created en_GB.lang

Created en_GB.lang for the pedantic brits!

Changes Niter -> Nitre & Sulfur -> Sulphur

(Did it right this time)
Adjust licensing
Merge remote-tracking branch 'Vexatos/patch-1' into feature/localization
Merge remote-tracking branch 'SeanTheBaker/patch-1' into feature/localization
Standardized file headers
Merge branch 'feature/localization' into develop
Added Niter and Zinc ores from @goldbattle. Progress on #2
Create ru_RU.lang
Added @Rosethorns' textures for #1
Merge remote-tracking branch 'Adaptivity/patch-2' into feature/add_ru_RU_localization
Standardized description from http://lh.2xlibre.net/locale/ru_RU/
Merge branch 'feature/add_ru_RU_localization' into develop
Update en_GB.lang

Noticed i missed Nitre Ore and Sulphur Ore (derp :P)
Simplified reference classes
Added cupola model to block.