Simplifying setup.py.

setup.py

@@ -27,20 +27,14 @@ def main():
             "ase==3.15.0",
             "setuptools",
             "scipy",
-
             "panedr==0.2",
             "parmed==3.0.0",
             "pandas",
             "pyyaml",
             "h5py",
             "hjson",
-            "enum34"],
-        extras_require={
-            "md": [
-                "mdtraj==1.9.1",
-                "mdanalysis==0.16.2"
-            ]
-        },
+            "mdtraj==1.9.1",
+            "mdanalysis==0.16.2"]
     )
 
 # Run main function by default