I actually get the same issues trying to create a build on windows. (Version 1.1)
Could it be an issue with the Unity Package missing asmdef files? I don't see any when I do the import?
I did a little digging, and I was able to get it building without having to hunt down all the #if UNITY_EDITOR placements.
I moved MAST_Prefab_Component into a new folder called Components that's along side the Scripts folder. I then added an asmdef file in both folders, I set the scripts' asmdef to be editor only, and gave it a reference to the components' asmdef.