Panel: use self._off for panelclose instead of document.off

Fixes gh-7058
Closes gh-7260
Panel: Fix bad function reference in unit tests

Fixes gh-7500
Closes gh-7501
Navigation: Clean up beforenavigate test to avoid double-start()
Navigation: Add jqm-tests.css to sequence-redirect.html
Toolbar: Add CSS to jqm-tests.css to hide fixed toolbars from test page
Navigation: Fix scrollTop retention test for Chrome
Navigation: Coding standards in the integration tests