gistfile1.xsl

<FilesMatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|js|css|swf)$">
  FileETag none

  <IfModule mod_headers.c>
      Header set Expires "Thu, 15 Apr 2015 20:00:00 GMT"
  </IfModule>

  <IfModule mod_expires.c>
      ExpiresActive On
      ExpiresDefault "modification plus 10 years"
      FileETag none
  </IfModule>
</FilesMatch>

<IfModule mod_deflate.c>
  <FilesMatch "\.(js|css)$">
    SetOutputFilter DEFLATE
  </FilesMatch>
</IfModule>