Minor fixes for 0.6.1

bowser-ios: Remove obsolete import

Fixed crash when leaving page with overlay rendering

Fixed overlay detection

Rebased on top of WKWebView changes

Add overlay rendering support

Added libiconv and updated pods

Uses latest OpenWebRTC pod

Fetch pod via git

New version 0.6 requires iOS 9.0

Updates URL bar address properly

Hooked up progress indicator

Moved OpenWebRTC initialisation

Removed WebView from storyboards

Init OpenWebRTC