Linefeeds on iris slides.@
Merge branch 'iris' of github.com:pelson/courses into iris

* 'iris' of github.com:pelson/courses:
  Updated iris course and added exercise notebooks.
  Updated iris code and added exercise notebooks for Iris.
  Updated Iris course content.
  Fixed spellings.

Conflicts:
	build/iris_intro.html
	build/iris_intro.slides.html