fix extension modules to include exceptions

rmgmolecule_setup.py

@@ -147,21 +147,7 @@
 
 scripts = []
 
-modules = []
-for root, dirs, files in os.walk("molecule"):
-    if "test_data" in root:
-        continue
-    for f in files:
-        if f.endswith(".py") or f.endswith(".pyx"):
-            if "Test" not in f and "__init__" not in f:
-                module = (
-                    "molecule"
-                    + root.partition("molecule")[-1].replace("/", ".")
-                    + "."
-                    + f.partition(".py")[0]
-                )
-                modules.append(module)
-
+modules = ["rmgpy.exceptions"]
 
 __version__ = "1.0.0"
 
@@ -178,12 +164,13 @@
     url="http://reactionmechanismgenerator.github.io",
     packages=[
         "rmgpy.molecule",
-        "rmgpy.exceptions",
     ],
     py_modules=modules,
     scripts=scripts,
     ext_modules=cythonize(
-        ext_modules, build_dir="build", compiler_directives=directives
+        ext_modules,
+        build_dir="build",
+        compiler_directives=directives,
     ),
     include_dirs=[".", numpy.get_include()],
 )