Simplify vim file type detection (#30)

Author: tyll

tools/editor-modes/vim/filetype.vim

@@ -1,10 +1,2 @@
-" If ~/.vim/filetype.vim does not exist, install this file there.
-" Otherwise, hand merge it with the existing ~/.vim/filetype.vim.
-
-if exists("did_load_filetypes")
-  finish
-endif
-augroup filetypedetect
-  au! BufRead,BufNewFile *.nc   setfiletype nesc
-augroup END
-
+" install in ~/.vim/ftdetect/nesc.vim
+au! BufRead,BufNewFile *.nc   setfiletype nesc