Add moonscript support

ftplugin/moon.vim

@@ -0,0 +1,20 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'moonscript') == -1
+  
+" Language:    MoonScript
+" Maintainer:  leafo <leafot@gmail.com>
+" Based On:    CoffeeScript by Mick Koch <kchmck@gmail.com>
+" URL:         http://github.com/leafo/moonscript-vim
+" License:     WTFPL
+
+if exists("b:did_ftplugin")
+  finish
+endif
+let b:did_ftplugin = 1
+
+setlocal formatoptions-=t
+setlocal comments=:--
+setlocal commentstring=--\ %s
+
+let b:undo_ftplugin = "setlocal commentstring< comments< formatoptions<"
+
+endif