add support for live view templates (elixir-editors#483)

Author: cadebward

ftdetect/elixir.vim

@@ -1,5 +1,5 @@
 au BufRead,BufNewFile *.ex,*.exs set filetype=elixir
-au BufRead,BufNewFile *.eex set filetype=eelixir
+au BufRead,BufNewFile *.eex,*.leex set filetype=eelixir
 au BufRead,BufNewFile * call s:DetectElixir()
 
 function! s:DetectElixir()