Merge pull request #38 from aerenchyma/fixwk6solns

Fix week 6 section review problems
moved and linked to discussion section assignments
switched order of problems being fetched so that it grab most recent code first, and not the last bit
made grade redirect back to referer
made grade link on detail go to right place
made assignments labeled by name
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
edited while loops chapter
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
for else loop doesnt actually work - replaced with if statement to protect from over 0 division
updated assignments/index view because for else statment doesnt actually work
Merge pull request #40 from nickdotreid/pip

Nested Data Structures Update AND Week 7 warm up problems
comment out PS6; not ready yet
add readingresp qx for wk7