Support custom maps

Closes tpope#2

README.markdown

@@ -39,14 +39,6 @@ Relax!  You just have to adjust `'commentstring'`:
 
     autocmd FileType apache set commentstring=#\ %s
 
-> What if I want custom maps?
-
-Fly by the seat of your pants and map directly to the `\` maps:
-
-    xmap gc  \\
-    nmap gc  \\
-    nmap gcc \\\
-
 Contributing
 ------------
 

plugin/commentary.vim

@@ -46,8 +46,14 @@ function! s:go(type) abort
   endif
 endfunction
 
-xnoremap <silent> \\  :<C-U>call <SID>go(visualmode())<CR>
-nnoremap <silent> \\  :<C-U>set opfunc=<SID>go<CR>g@
-nnoremap <silent> \\\ :<C-U>call <SID>go(v:count1)<CR>
+xnoremap <silent> <Plug>Commentary     :<C-U>call <SID>go(visualmode())<CR>
+nnoremap <silent> <Plug>Commentary     :<C-U>set opfunc=<SID>go<CR>g@
+nnoremap <silent> <Plug>CommentaryLine :<C-U>call <SID>go(v:count1)<CR>
+
+if maparg('\\') ==# ''
+  xmap \\  <Plug>Commentary
+  nmap \\  <Plug>Commentary
+  nmap \\\ <Plug>CommentaryLine
+endif
 
 " vim:set sw=2 sts=2: