Pushed antranig's fix at ca843c2cffac362c095ffdf00f8e6529336b9a6d

Antranig has made a pull request for a potential fix.
https://github.com/fluid-project/infusion/pull/57

==== Brief ====
It seems like rsf:id + IE9 Document mode is the cause of this problem. The details on the differences between IE8 and IE9 that causes this failure are uncertain. I have tried using different doctypes, and the result is not consistent. I have also tried using HTML5's doctype, still no luck.

==== Steps to Reproduce ====
1. create an HTML page that loads jquery.js and fluid.js
2. create 2 divs,
<div id="test-no-rsf-id">No rsf:id</div>
<div id="test-with-rsf-id" rsf:id="apple">with rsf:id</div>
3. run fluid.jById('test-with-rsf-id'); on IE9, it will fail.
4. run fluid.jById('test-no-rsf-id'); on IE9, it should pass.

==== More Details ====
If we run document.getElementById('test-with-rsf-id').getAttribute('id'), it will return null.
If we try to get the list of attributes,
document.getElementById('test-with-rsf-id').attributes[0].name --> 'rsf:id'
document.getElementById('test-with-rsf-id').attributes[1].name --> 'rsf:id'
It seems like the attribute "id" is overwrote by rsf:id in IE9's DOM. Where as in FF and Chrome, it's
document.getElementById('test-with-rsf-id').attributes[0].name --> 'id'
document.getElementById('test-with-rsf-id').attributes[1].name --> 'rsf:id'
Note: This is true even without both jQuery and Fluid libraries.

==== Unit test ====
I have added a unit test for this, https://github.com/harriswong/infusion/commit/c254cc75d213b534f3898e07c96525e590d84339

==== Suggested Fix ====
There are a few options to address this problem:
1. Remove rsf:id, since image reorderer doesn't need rsf:id.
2. Add meta-data to force IE9 to use other document mode. <meta http-equiv="X-UA-Compatible" content="IE=xxx" >, http://msdn.microsoft.com/en-us/library/cc288325%28v=vs.85%29.aspx
3. This could be an IE9 bug since it makes no sense to overwrite the "id" attribute with our custom attribute "rsf:id". We may want to mark this test case as "expected to fail with IE9" and wait till it's fixed, then re-test it again.

==== Additional info ====
Posted a thread in MSDN, http://social.msdn.microsoft.com/Forums/en-US/iewebdevelopment/thread/dca80bb2-20b2-4029-8600-cd363cc64ddd

Seems to be related to document mode in IE9. If we switch Ducument Mode to IE8 and below, the tests will pass.

Added unit tests for IE9 and attributes with both "id" and "rsf:id", https://github.com/harriswong/infusion/tree/FLUID-3953