Start fixing #214 - workaround for bug in IE8 iframe onload implementation

IE8 doesn't honour onload listeners attached using Javascript. See:

    http://stackoverflow.com/questions/12910534/why-doesnt-ie8-handle-iframe-onload-events

This commit attaches the handler using HTML instead.

A further commit will be needed to reorder the code to avoid a race condition
where the iframe is initialized before the handler is setup.
Finish fixing #214 - workaround for bug in IE8 iframe onload implementation

Reorder the code that sets up the iframe onload handler to ensure
the handler is defined before the iframe is added to the window.
Rebuild with fix for #214
+ disabled: false
- 100px
 * resolve conflicts (#215)
Merge branch 'davegurnell-ie8iframe'