Added unit test for issue #2537 - Add new pageremove event.
Added unit test for issue #2537 - Add new pageremove event.

The test makes use of a pageremove callback that conditionally calls preventDefault() on the event so that the test can make sure a developer can prevent a specific page from being removed from the DOM.

startxfr/jquery-mobile,arschmitz/uglymongrel-jquery-mobile,arschmitz/uglymongrel-jquery-mobile,startxfr/jquery-mobile,rwaldron/jquery-mobile,npmcomponent/cbou-jquery-mobile,startxfr/jquery-mobile,arschmitz/jquery-mobile,rwaldron/jquery-mobile,hinaloe/jqm-demo-ja,npmcomponent/cbou-jquery-mobile,hinaloe/jqm-demo-ja,arschmitz/jquery-mobile,arschmitz/jquery-mobile,npmcomponent/cbou-jquery-mobile,arschmitz/uglymongrel-jquery-mobile,hinaloe/jqm-demo-ja