More metadata fixes for JSON playlist and HTML scraping

- Try to avoid taking title from JSON playlist - it's broken
- Ensure all JSON/HTML parsed values are place in $prog hash
- Move *short variable generation to pick up JSON/HTML parsed values
Added --swfurl option

Use --swfurl to specify Flash player URL used by rtmpdump for
verification.  Shortcut for --rtmp-tv-opts="--swfVfy=<URL>".
Updated SWF player URL