Match any number of leading spaces in config values

The regex comments state that any number of leading tabs or spaces
should be allowed, however the regex was only catching zero or one
space.  This allows multiple spaces.

Author: jkeating

Diff for: git/config.py

@@ -124,7 +124,7 @@ class GitConfigParser(cp.RawConfigParser, object):
 	#} END configuration 
 
 	OPTCRE = re.compile(
-		r'\s?(?P<option>[^:=\s][^:=]*)'		  # very permissive, incuding leading whitespace
+		r'\s*(?P<option>[^:=\s][^:=]*)'		  # very permissive, incuding leading whitespace
 		r'\s*(?P<vi>[:=])\s*'				  # any number of space/tab,
 											  # followed by separator
 											  # (either : or =), followed