I tried to compile the test example in windows and come up with this error
pawn = ezfc.union(myCone,mySphere)
File "C:\WinPython\WinPython-64bit-2.7.10.3\python-2.7.10.amd64\lib\site-packages\ezFreeCAD\__init__.py", line 156, in union
u = thingA.multiFuse(thingsB,tol).removeSplitter().Solids
OCCError: Fuzzy Booleans are not supported in this version of OCCT
I have FreeCAD 0.16 installed.