Fixed image url

Author: joelvh

app/assets/javascripts/grape_swagger_rails/swagger-ui.js

@@ -352,7 +352,7 @@ function program9(depth0,data) {
 function program11(depth0,data) {
 
 
-  return "\n          <div class='sandbox_header'>\n            <input class='submit' name='commit' type='button' value='Try it out!' />\n            <a href='#' class='response_hider' style='display:none'>Hide Response</a>\n            <img alt='Throbber' class='response_throbber' src='images/throbber.gif' style='display:none' />\n          </div>\n          ";
+  return "\n          <div class='sandbox_header'>\n            <input class='submit' name='commit' type='button' value='Try it out!' />\n            <a href='#' class='response_hider' style='display:none'>Hide Response</a>\n            <img alt='Throbber' class='response_throbber' src='/assets/grape_swagger_rails/throbber.gif' style='display:none' />\n          </div>\n          ";
   }
 
   buffer += "\n  <ul class='operations' >\n    <li class='";