Use correct mode for executable files

Fixes #430

Author: Byron

git/index/fun.py

@@ -93,7 +93,7 @@ def stat_mode_to_index_mode(mode):
         return S_IFLNK
     if S_ISDIR(mode) or S_IFMT(mode) == S_IFGITLINK:    # submodules
         return S_IFGITLINK
-    return S_IFREG | 0o644 | (mode & 0o100)       # blobs with or without executable bit
+    return S_IFREG | 0o644 | (mode & 0o111)       # blobs with or without executable bit
 
 
 def write_cache(entries, stream, extension_data=None, ShaStreamCls=IndexFileSHA1Writer):

git/repo/base.py

@@ -628,7 +628,7 @@ def untracked_files(self):
         :note:
             ignored files will not appear here, i.e. files mentioned in .gitignore
         :note:
-            This property is expensive, as no cache is involved. To process the result, please 
+            This property is expensive, as no cache is involved. To process the result, please
             consider caching it yourself."""
         return self._get_untracked_files()