Better PEP8 conformance.

Author: StuntsPT

setup.py

@@ -9,12 +9,12 @@
     from setuptools import setup
 
 if platform.system() == "Linux":
-    bin_dir = "bins/linux"
+    BIN_DIR = "bins/linux"
 elif platform.system() == "Darwin":
-    bin_dir = "bins/osx"
+    BIN_DIR = "bins/osx"
 
-structure_bin = bin_dir + "/structure"
-faststructure_bin = bin_dir + "/fastStructure"
+STRUCTURE_BIN = BIN_DIR + "/structure"
+FASTSTRUCTURE_BIN = BIN_DIR + "/fastStructure"
 
 setup(
     name="structure_threader",
@@ -39,7 +39,7 @@
                  "Natural Language :: English",
                  "Operating System:: POSIX:: Linux",
                  "Topic :: Scientific/Engineering :: Bio-Informatics"],
-    data_files=[('bin', [faststructure_bin, structure_bin])],
+    data_files=[('bin', [FASTSTRUCTURE_BIN, STRUCTURE_BIN])],
     entry_points={
         "console_scripts": [
             "structure_threader = structure_threader.structure_threader:main",