Added rule for fixing Alt+Space character

Happens on the Mac a lot when typing a pipe character (Alt+7), and
keeping the Alt key pressed down for a bit too long, so instead of
Space, you're typing Alt+Space. This rule replaces the Alt+Space with a
simple Space character.

$ ps -ef | grep foo
-bash:  grep: command not found
$ fuck
ps -ef | grep foo

thefuck/rules/fix_alt_space.py

@@ -0,0 +1,15 @@
+# -*- encoding: utf-8 -*-
+
+import re
+from thefuck.utils import sudo_support
+
+
+@sudo_support
+def match(command, settings):
+    return ('command not found' in command.stderr.lower()
+            and u' ' in command.script)
+
+
+@sudo_support
+def get_new_command(command, settings):
+    return re.sub(u' ', ' ', command.script)