title: Associate .Rnw with vim latex suite
body: <p>This I am sure is really basic stuff. I am just beginning using gvim and latex-suite. However I would like latex-suite to load when I edit a sweavefile with.Rnw extension.</p>
  
  <p>my .vimrc looks like this</p>
  
  <pre><code>" These settings are needed for latex-suite
  filetype indent on
  filetype plugin on
  filetype on
  let g:tex_flavor='latex'
  set grepprg=grep\ -nH\ $*
  "let g:Tex_Folding=0 "I don't like folding.
  set iskeyword+=:
  </code></pre>
  
  <p>and I guess there is some option I can set here that makes vim treat Rnw as .tex?</p>