Fix talk.go bugs and make more automatic.
Fix talk.go bugs and make more automatic.

geraldchecka/2014-talks,0111001101111010/2014-talks,geraldchecka/2014-talks,geraldchecka/2014-talks,0111001101111010/2014-talks,0111001101111010/2014-talks,gophercon/2014-talks,geraldchecka/2014-talks,gophercon/2014-talks,gophercon/2014-talks