title: geany custom filetype .sass for syntax highlighting
body: <p>I know there are some answers around, but all incomplete.<br>
  Can't get a working .sass syntax highlighting.<br>
  I followed all the steps described <a href="http://www.geany.org/manual/current/index.html#custom-filetypes" rel="nofollow">in the official guide</a>,
  but no luck.</p>
  
  <p>Steps made:<br>
  copied from css file:</p>
  
  <pre><code># cp /usr/share/geany/filetypes.css ~/.config/geany/filedefs/filetypes.sass.conf
  </code></pre>
  
  <p>with the needed .sass.conf extension. 
  I've set the </p>
  
  <pre><code>extension=.sass
  </code></pre>
  
  <p>(at this point in geany Document menu I can already find the new file type "sass file")</p>
  
  <p>I copied and edited <code>filetype_extensions.conf</code> in my <code>~/.config/geany</code> adding:</p>
  
  <pre><code>SASS=*.sass;
  </code></pre>
  
  <p>Now, I guess only one thing's missing, the lexer_filetype and/or tag_parser declaration
  in the former <code>filetypes.sass.conf</code>, but I can't find many informations about this.
  What are available lexer?
  I tried with a simple <code>lexer_filetype=css</code> and <code>tag_parser=css</code> but nothing.</p>
  
  <p>Any clue from anyone who managed to run this before?</p>