Bugfix - "Allow always" option in flash dialog of microphone request

On Internet Explorer running in Winows8+ Modern UI we can choose "Allow always" option in dialog of microphone request. After we refresh website, microphone use is already allowed on `document.ready`. It was causing that there was no time to catch `StatusEvent.STATUS`. I've added microphone availability check, just after `READY` has been dispatched.
We can simulate behaviour similar to Win8 ModernUI IE "Allow always" in other browsers. To do this we have to right-click on microphone request dialog, select "Settings" then settings tab with eye icon. On this tab we have to check "Remember" checkbox and then click "Allow".

This pull request is independent form my last one request (feature/pause).