Default the embedded youtube to html5.

The embed API will already select HTML5 if flash is not available, or if
the user has selected HTML5 themselves at YouTube, so this might not be
useful.
Change the youtube template to match the v4_topic template.

I am not sure if this one is even used, but changed it for completeness.
Put Dundee in the right place.

The location of the Dundee bootcamp in
the map on http://software-carpentry.org/bootcamps/previous.html
was in Exeter.
Merge pull request #423 from andreww/master

Fix lat/lon for Dundee bootcamp
Merge pull request #416 from dmj111/youtube-links

Youtube links
UCAR bootcamp
Merge branch 'master' of github.com:swcarpentry/site