added twitter block to class homepage, but it needs to be generalized...
changed to using 'course_prefix' as part of the twitter handle (eg. @ 'db' class) this should pretty much fix #2247
changing back to hardcoded twitter handle, will revisit later with input from @jinpa and others (#2247)
moved code into a django block and made it appear only on the homepage
#2298 - Add "Username" as column title for Student Scores in-line report
Merge pull request #2299 from Stanford-Online/dca_2298_add_username

#2298 - Add "Username" as column title for Student Scores in-line report
made radio/check imputs line up next to labels in all cases
Merge pull request #2302 from Stanford-Online/giulio-input-styling

radio/check inputs now line up next to labels in all cases
add missing import to fix "-s" on regrade (fix #2303)
Merge branch 'master' of https://github.com/Stanford-Online/class2go into giulio-twitter-widget-2247
Merge pull request #2304 from Stanford-Online/sef-2303-regrade-dash-s-import

add missing import to fix "-s" on regrade (fix #2303)
selenium test fix: yt embed name change (fix #2305)

The youtube embed used to be id="video-player-flash" now it's
id="video-player", breaking our selenium test.  This fixes it.
Remove elementtree from requirements (#2305)

Only thing requiring this was our DNS registration doohickey, and even
then it only required this package explicitly when xml.etree wasn't
available.  Best I can tell that is just prior to Python 2.5, which we
don't want to support.  Ergo safe to remove.
selenium test, remove errant import (sleep) (#2305)
Merge pull request #2308 from Stanford-Online/sef-2305-selenium-retry

Get selenium tests working on Travis (again) (#2305)
final twitter widget code changes (using twitter widget version 2)
Merge branch 'master' of https://github.com/Stanford-Online/class2go into giulio-twitter-widget-2247
Merge pull request #2312 from Stanford-Online/giulio-twitter-widget-2247

Class Twitter widget on class homepage
Change to s3boto monkeypatch to allow no auth

Change to s3boto monkeypatch to allow no auth - course images and
instructor photos shouldn't have auth strings

Fixed typo for attachment
Merge pull request #2316 from dglance/dglance-s3boto-url

Change to s3boto monkeypatch to allow no auth