make UserProfile searchable and username readonly in django admin
Change urls that match an id to match negative or positive id's. (#2495)
Merge branch 'master' of http://github.com/Stanford-Online/class2go into dca_working
Allow switch for headless mode on any course page #2411

Once logged in you can now specify ?headless=1 to any page to go
into headless mode. To turn it off simply specify ?headless=0 to
any page.
fix package names for pdfkit and dateutil

Ironically enough, the two changes needed conserve characters.
python-pdfkit --> pdfkit
dateutil --> python-datetil
Merge pull request #2496 from Stanford-Online/dca_working

change urls that match an "id" to also match a negative "id"
Merge pull request #2494 from Stanford-Online/jbau-django-userprofile-admin

make UserProfile searchable and username readonly in django admin
Style changes for instructors

Style changes for instructors
https for fonts in main styles to stop https warnings
add pick up of site styles
added score buttons to profile page
removed extra reference lines and properly defined new filter
fix non-working accessibility hidden text toggle
Merge pull request #2506 from Stanford-Online/giulio-show-scores

Score buttons added to profile page
added aria landmark header to side nav
Merge branch 'master' of https://github.com/Stanford-Online/class2go into giulio-tpg-report-2290
Merge pull request #2497 from Stanford-Online/kluo-2411-headless

Allow switch for headless mode on any course page #2411
Merge pull request #2503 from dglance/dglance-instructor-styles

Style changes for instructors
removed unecessary function reference
change multiplechoice regex to not need . after wrong or right
Merge branch 'master' of https://github.com/Stanford-Online/class2go into giulio-tpg-report-2290
stop generat+send daily gnuplot graphs (fix #2510)