Vim 8.1 release

Update version number and information.  Fix a couple of tests.
diff --git a/runtime/doc/if_lua.txt b/runtime/doc/if_lua.txt
index 2d6dcfc..51e332d 100644
--- a/runtime/doc/if_lua.txt
+++ b/runtime/doc/if_lua.txt
@@ -1,4 +1,4 @@
-*if_lua.txt*    For Vim version 8.0.  Last change: 2015 Oct 16
+*if_lua.txt*    For Vim version 8.1.  Last change: 2015 Oct 16
 
 
 		  VIM REFERENCE MANUAL    by Luis Carvalho