Remove and replace compat.izip

Author: Harmon758

Diff for: git/compat.py

@@ -12,9 +12,6 @@
 import sys
 
 
-from gitdb.utils.compat import (
-    izip,       # @UnusedImport
-)
 from gitdb.utils.encoding import (
     string_types,    # @UnusedImport
     text_type,       # @UnusedImport

Diff for: git/index/base.py

@@ -11,7 +11,6 @@
 import tempfile
 
 from git.compat import (
-    izip,
     string_types,
     force_bytes,
     defenc,
@@ -270,8 +269,8 @@ def new(cls, repo, *tree_sha):
 
         inst = cls(repo)
         # convert to entries dict
-        entries = dict(izip(((e.path, e.stage) for e in base_entries),
-                            (IndexEntry.from_base(e) for e in base_entries)))
+        entries = dict(zip(((e.path, e.stage) for e in base_entries),
+                           (IndexEntry.from_base(e) for e in base_entries)))
 
         inst.entries = entries
         return inst