Stop trying to lowercase commands, it wasn't working anyway

pip/__init__.py

@@ -149,11 +149,11 @@ def parseopts(args):
         sys.exit()
 
     # the subcommand name
-    cmd_name = args_else[0].lower()
+    cmd_name = args_else[0]
 
     # all the args without the subcommand
     cmd_args = args[:]
-    cmd_args.remove(args_else[0].lower())
+    cmd_args.remove(args_else[0])
 
     if cmd_name not in commands:
         guess = get_similar_commands(cmd_name)

pip/commands/__init__.py

@@ -67,14 +67,14 @@ def get_similar_commands(name):
     """Command name auto-correct."""
     from difflib import get_close_matches
 
+    name = name.lower()
+
     close_commands = get_close_matches(name, commands.keys())
 
     if close_commands:
-        guess = close_commands[0]
+        return close_commands[0]
     else:
-        guess = False
-
-    return guess
+        return False
 
 
 def _sort_commands(cmddict, order):