Fix #1019. Change how the engine is looked up, and cache the result.
Change the order in which the printrbot printers are listed. As requested by Brook. Added 2 new printrbot printers (still need to update data so it matches actual machines). Fixed problem where canceling the machine add wizard caused problems with a ghost machine being added. Added support to load UM2 dual extrusion firmware.
Make ConfigWizard use proper naming convention.
Add Printrbot Go large, fix info on MetalPlus and SimpleMakersKit, add printrbot logo image.
Added logo file.
Merge branch 'SteamEngine' of github.com:daid/Cura into SteamEngine