Fix parsing for files with whitespace

Currently, the Tree object won't include any files that contain
whitespace. split(c, 4) can return a 5-tuple, but we want a 4-tuple
instead.

Signed-off-by: Jeremy Kerr <[email protected]>

Author: jk-ozlabs

lib/git/tree.py

@@ -45,7 +45,7 @@ def content_from_string(repo, text):
             ``git.Blob`` or ``git.Tree``
         """
         try:
-            mode, typ, id, name = text.expandtabs(1).split(" ", 4)
+            mode, typ, id, name = text.expandtabs(1).split(" ", 3)
         except:
             return None