* Update PDF annotation buttons so that the text is visible as well as the icon. Fixes #814.

* Remove unnecessary comment.

* Added search table

* Fixed student search bar

* fixed problems page redirect

* set up tab redirects by including a tag with each submit button

* Fixed basic bug and commented code

* removed vscode

Namely address launch.json but also removes any additional vscode IDE-specific configurations

* Fix Manage Submissions Page functionality (#805)

* use $? instead of $CHILD_STATUS in Moss (#804)

* Changed the database from mysql to sqlitefor development purposes (#719)

* Added materialize gem and phased out bootstrap (#720)

* Integrated new navbar (#721)

* Change lab template image to autograding_image for use with Tango Docker

* Bump ruby version for rspec testing framework

* Add mysql gem to Autolab2.0

* Navbar icons (#725)

* navbar_icons

* button fixes

* Change lab template image to autograding_image for use with Tango Docker

* Bump ruby version for rspec testing framework

* Add mysql gem to Autolab2.0

* navbar_icons

* button fixes

* Material Course List and Assessment List (#731)

* Update courses index page

* Update Assessments index page

* update course list display logic

* Add materialize style to course and assessment card pages

* Assessment page redesign (#741)

* Convert assessment page cols from bootstrap to materialize

* Convert initial collections and cards

* Add styles and html for Danger Zo...

* add full name to manage_submissions page to enable search by name

* enable partial searching on create submission page to allow search by email

* show name along with email in extension page to allow search by name

API requests (e.g. annotations) should not try to display
donkey kong when they fail, since that just triggers another
error

fork with a block does not seem to propagate exceptions in the subprocess
to rescue blocks outside the fork block, so exceptions inside scheduler
modules were not being logged. Trap them inside the fork block, also trap
ScriptError exceptions, and send the subprocess exceptions to
ExceptionNotifier.

Since moss can run for an extended period of time, it is possible
for database connections to time out while it is running. ActiveRecord
does not check database connections for liveness whenever they are used,
only when they are checked out or back in to the connection pool.

Make activerecord return all active connections to the pool before running
moss, so any post-moss database access will use hopefully-live connections.

implement cache on gradesheet page to save on change only

Faster Gradesheet (on-demand feedback and deferred rendering)