2016-06-08: remove exit 0

remove exit 0

diff --git a/examples/d20world.w b/examples/d20world.w
--- a/examples/d20world.w
+++ b/examples/d20world.w
@@ -275,7 +275,6 @@ define : main args
          set! args : append args '("45") ; lon
        display : latlon2cellidx (string->number (first (take-right args 2))) (string->number (last args))
        newline
-       exit 0
        display : d20-as-text world
        newline