Update scripts for pip

setup.py

@@ -64,6 +64,7 @@ cython_files = [
                     "SimPEG/Mesh/TreeUtils"
                ]
 extensions = [Extension(f, [f+ext]) for f in cython_files]
+scripts = [f+'.pyx' for f in cython_files]
 
 if USE_CYTHON and "cleanall" not in args:
     from Cython.Build import cythonize
@@ -95,5 +96,6 @@ setup(
     use_2to3 = False,
     include_dirs=[np.get_include()],
     ext_modules = extensions,
+    scripts=scripts,
     **cythonKwargs
 )