Add mode information for codemirror to properly style html
missing html output div in grading interface
simple script to summarize new tickets
Bug fix:  compare date against date not datetime
Add writeln
fix copyright statement
Fixed divide by 0 error for viewing group schedule

Added an if total > 0: line to keep the server from crashing with a divide by zero error due to the user having no user chapter progress.  This occurs when a user has yet to view any of the chapters of the book and attempts to access the group schedule.  Since the user's chapter progress will not exist, total will remain 0, causing this to break when it tries to calculate result by dividing by total, which will remain 0.
Merge pull request #524 from StevenJamesMoore/master

Fixed divide by 0 error for viewing group schedule
fix for bad wording #514
Merge branch 'master' of github.com:bnmnetp/runestone
update gratipay badge.
fix preorder example.  fixes #520
motivated to fixup min/max width/heigh on codemirror
Do not show progress button on assignments page
switched to a capital S in the "theSum"
Merge pull request #532 from sbellem/typos

switched to a capital S in the "theSum"
Merge branch 'master' of github.com:bnmnetp/runestone
make ref to pythontutor.com http or https depending on location.protocol; in bookfuncs.js only, may want to do it for other places where the url is hardcoded