Fix for Issue #162 

I have found the cause and a fix for this issue.

Proposed fix for blur cancel/submit not working in IE8
https://github.com/vitalets/angular-xeditable/issues/162

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The `onblur` is implemented by listening a mouse click on the document. 

In `editable-form/controller.js`, 

	// bind click to body: cancel|submit|ignore forms
	$document.bind('click', function (e) {

		// ignore right/middle button click
		if (e.which !== 1) {
		    return;
		}

The issue is caused by `event.which` (http://api.jquery.com/event.which/) reporting `0` for **all mouse clicks in IE8**, forcing this function to return early. This has been reported as a jQuery bug (http://bugs.jquery.com/ticket/13209), however it was subsequently closed as apparently the button data isn't available in IE8.

**Solution**

Change `$document.bind('click', function (e)` to `$document.bind('mouseup', function (e)` as the mouseup event has the correct data for the `.which` property. 

I have tested this in IE8, IE11, Firefox 17, Chrome.