IE 10-11+ deserialize history.state on every read, causing simple comparisons
against history.state always return false. Account for that caching
`history.state` on every hashchange or popstate event.
Also:
1. Prevent firing onUrlChange callbacks twice if both popstate and hashchange
event were fired.
2. Fix the issue of routes sometimes not firing the URL change in all browsers.
Closes#9587Fixes#9545