The html at ted.com/talks/<talk>.html changed again.
Updated scraping of "talkId" and "introDuration" for the current TED website.
This makes subtitles work again.
fixed form authentication to work with the current TED website.
Merge pull request #35 from omega32/master

updated scraping to make subtitles work again
fixed form authentication to work with the current TED website
Fix test (the key for the value had changed).