updated a few article links to other sites

"Snowbum's" BMW tech web site is now http://bmwmotorcycletech.info/.
We had three articles that linked to a no-longer-online location.
updated a few article links to other sites

Duane Ausherman's site was at the same address but he had changed the
URL scheme so two of the links on the article page 404'd.
Merge branch 'master' of github.com:erimille/5united

Conflicts:
	public/articles/index.html