Converting to individual challenge div's in the novice shell lessons
Converting to single-div-per-challenge in novice Git tutorial
Bugfix: missing file `fractal_1.txt` replaced with `small-01.csv`
Fixed problem with range_overlap tests in ipynb file
Fixed problem with range_overlap tests in .md file
Updated an error message
Removed reference to the reverse method in ipynb file
Removed reference to the reverse method in md file
Merge pull request #525 from zonca/formatting_fixes

Bugfix: missing file fractal_1.txt replaced with small-01.csv in python lesson 6
Edited wording of reverse challenge in ipynb file
Edited wording of reverse challenge in md file
Put 3 spaces after bullet points
Merge pull request #526 from DamienIrving/lesson_fixes

Some minor fixes to challenges in some lessons
updated discussion list URL

Current URL for the discussion list takes the user to a 404 page

current: http://software-carpentry.org/contrib/discuss.html
proposed: http://software-carpentry.org/pages/discuss.html
Merge pull request #528 from benmarwick/fix-typo-in-contrib

updated discussion list URL
Merge pull request #514 from gvwilson/every-challenge-in-its-own-div

Put each challenge exercise in a div of its own.
Merge remote-tracking branch 'upstream/master'

weekly update to upstream