merge section 6 tests back into master
update practice.js
update section 7 and outline
finish section 7 narrative
add more to readme, names data and exercises to section 7
add first draft of practice problems to section 7
flesh out the practice problems in section 7
add test stubs for section 7
add runner for section 7
merge master into solutions
add tests and solutions for section 7
add tests to master branch and update practice.js
Merge branch 'master' into solutions