Merge pull request #39 from nickdotreid/pip

Assignment Grader Fixes
week 7, first content installment
Merge branch 'pip' of github.com:presnick/runestone into pip
removed simple_test_1 code -- seemed like that was sample data just hanging out
changed instructions for nested_data_6 so that correct dictionaries were referenced
got nested_data-1 to give correct data
added warm up problems to week 7