vim-patch:7.4.231

Problem:    An error in ":options" is not caught by the tests.
Solution:   Add a test for ":options".  Set $VIMRUNTIME for the tests so that
            it uses the current runtime files instead of the installed ones.

https://code.google.com/p/vim/source/detail?r=0a295a3c9e473512ad3b006a0fb752ad43d19094

src/nvim/version.c

@@ -364,7 +364,7 @@ static int included_patches[] = {
   234,
   233,
   232,
-  //231,
+  231,
   230,
   229,
   //228 NA