Update runtime files. Add support for J.

runtime/ftplugin/j.vim

@@ -0,0 +1,17 @@
+" Vim filetype plugin
+" Language:	J
+" Maintainer:	David Bürgin <676c7473@gmail.com>
+" Last Change:	2013-09-21
+
+if exists("b:did_ftplugin")
+  finish
+endif
+let b:did_ftplugin = 1
+
+setlocal iskeyword=48-57,65-90,_,97-122
+setlocal comments=:NB.
+setlocal commentstring=NB.\ %s
+setlocal formatoptions-=t formatoptions+=croql
+setlocal shiftwidth=2 softtabstop=2 expandtab
+
+let b:undo_ftplugin = "setl et< sts< sw< fo< cms< com< isk<"