Use new style of rails command.

plugins/rails3/rails3.plugin.zsh

@@ -4,7 +4,11 @@ function _rails_command () {
   if [ -e "script/server" ]; then
     ruby script/$@
   else
-    ruby script/rails $@
+    if [ -e "bin/rails" ]; then
+      bin/rails $@
+    else
+      rails $@
+    fi
   fi
 }