Add Known Issue/instructions to fix FOUC to readme. Addresses #56, #77.

Closes #92.

readme.md

@@ -86,6 +86,35 @@ been able to reproduce the problem on my machine, which leads me to believe
 that certain graphics settings in Windows must also be contributing to the
 bug. In any case, if this is a concern for you, avoid using fades for those
 effects options.
+* As noted by a number of people (issue [#56], [#60]), this plugin can cause 
+"flickering" in its expandable elements on loading the webpage. It usually happens when multiple other scripts are present and the expander stalls during its initialization. It is (sadly) an issue that stems directly from its method of making 
+expandable text, and cannot be fixed without changing what the plugin is, or how 
+it operates. Nonetheless, the flicker can be prevented by the same semi-hacky fixes normally used for other FOUC (flash of unstyled content) issues:
+
+  1. Add a JS script in the head that will add a "js" class to the html element 
+  (see http://www.learningjquery.com/2008/10/1-way-to-avoid-the-flash-of-unstyled-content/). 
+  This is done by JavaScript so that the element will not be hidden for clients with their JavaScript disabled/inoperable.
+
+  2. Add the following somewhere in your CSS (using your own class names):
+    ```css
+    .js .myexpander.js-myexpander-hidden { 
+      display: none; 
+    }
+    ```
+
+  3. Add a JS script that will execute later (bottom of body or within `$(document).ready()`):
+    ```js
+    $('.myexpander').expander().removeClass('js-myexpander-hidden');
+    ```
+
+  3.5. If you still see a little "flash" of unstyled content, add this script to remove the class in an onSlice callback:
+  ```js
+  $(.myexpander).expander({
+    onSlice: function() {
+      $(this).removeClass('js-myexpander-hidden');
+    }
+  });
+  ```
 
 ## Demo