Improve compatibility with FastFold.

Resolves all current concerns in ledger/vim-ledger issue #64.

Author: rcaputo

ftdetect/ledger.vim

@@ -1 +1 @@
-autocmd BufEnter,BufRead *.ldg,*.ledger setlocal filetype=ledger | compiler ledger
+autocmd BufNewFile,BufRead *.ldg,*.ledger setlocal filetype=ledger

ftplugin/ledger.vim

@@ -13,6 +13,10 @@ let b:undo_ftplugin = "setlocal ".
                     \ "foldtext< ".
                     \ "include< comments< commentstring< omnifunc< formatprg<"
 
+if !exists('current_compiler')
+  compiler ledger
+endif
+
 setl foldtext=LedgerFoldText()
 setl include=^!\\?include
 setl comments=b:;