Updated code quality class doc string, import ignore & comment spaces in setup.py

setup.py

@@ -27,6 +27,8 @@ EXTRAS_REQUIRE = {
 
 
 class InstallCmd(install):
+    '''Install cmd'''
+
     def run(self):
         # prepare icons directories
         try:
@@ -84,7 +86,7 @@ if __name__ == "__main__":
             "msgpack-python" if msgpack.version[:2] < (0, 6) else "msgpack")
     except ImportError:
         try:
-            import umsgpack
+            import umsgpack  # noqa:F401
             installRequires.append("umsgpack")
         except ImportError:
             packages += ['pybitmessage.fallback.umsgpack']