title: Prevent image caching in rails on a per tag basis
body: <p>We are using gravtars for a site currently being developed in rails 2.3.4 and i am finding that the rails side tends to cache the images even after there is a change at the gravtar side.  I know with javascript you can prevent caching when using the<code>javacript_include_tag :cache =&gt; false</code> method, however, is there a way to prevent the cache when using the <code>image_tag</code> helper?</p>
  
  <p>I have read around a bit and it would appear that it used to append the timestamp information after the url with some paramaters (i.e. <code>src="image.png?123123"</code>), but it doesn't seem to do it anymore.</p>
  
  <p>Any ideas, or should i stop using those damn helpful helpers as a crutch and for once in my rails developing life write some actual code?</p>