IE / IE11 issues

[puzrin]

That's not a bug report, because IE works as expected - it sucks. This ticket is for the records.

1. IE11 does not broadcast events from iframe localStorage.
   • https://connect.microsoft.com/IE/feedback/details/811546/ie11-localstorage-events-fire-twice-or-not-at-all-in-iframes
2. IE (all versions) localStorage event onstore emited before data really saved.
   • https://connect.microsoft.com/IE/feedback/details/812563/ie-11-local-storage-synchronization-issues
   • currently workarounded via setTimeout, but this is not perfect
3. IE8 miss key info in event

More info to read https://github.com/bemson/subetha-bridge/issues/1