git.py: always use "git foo" and never "git-foo"

gitsters on the git mailing list have been slowly deprecating
the usage of "git-foo" commands.  The preferred invocation
is "git foo".

Signed-off-by: David Aguilar <davvid@gmail.com>

Author: davvid

lib/git_python/git.py

@@ -82,7 +82,7 @@ def method_missing(self, method, *args, **kwargs):
         ext_args = map(lambda a: (a == '--') and a or "%s" % a, args)
         args = opt_args + ext_args
 
-        call = ['git-'+dashify(method)]
+        call = ["git", dashify(method)]
         call.extend(args)
 
         stdout_value = self.execute(call)