Merge pull request #99 from benoit-pierre/fix_ro_error

fix error when vim is in read-only mode

plugin/bufexplorer.vim

@@ -475,6 +475,7 @@ function! s:DisplayBufferList()
     " the buffer using CTRL-^.
     setlocal buftype=nofile
     setlocal modifiable
+    setlocal noreadonly
     setlocal noswapfile
     setlocal nowrap