Call s:setup() directly in the plugin. Should fix #202.

- Move 'call s:setup()' out of the autocmd.
- Add a test for the first buffer without filetype set.

test/first_buffer_no_ft.vim

@@ -0,0 +1,8 @@
+let g:delimitMate_expand_cr = 1
+let g:delimitMate_eol_marker = ';'
+call vimtest#StartTap()
+call vimtap#Plan(1)
+call vimtap#Like(maparg('(', 'i'), '<Plug>delimitMate(', 'Mappings defined for the first buffer without filetype set.')
+call vimtest#Quit()
+
+