Make turn headers into clickable links.

Like line numbers in github diffs: you can click on a turn header,
and your browser's location bar becomes a link you can paste to
someone else (eg, forum topics like 'Best moments of 2014')
Update logprettifier.html

Forgot the `#` in my anchor link.
Merge pull request #16 from amalloy/master

Make turn headers into clickable links