Add Campaign factory
First basic tests for HeroSelectModal in demo flow
Implement HeroSelectModal for demo flow
Improve tests
Disable empty test
Fix text inconsistency around 'me'
Just listen once
Add HeroSelectModal events test
Don't reuse destroyed modal
Fix inconsistent modal close behavior
Fix tests
* Switch from auth.loginUser to User.loginPasswordUser with Promise
* Remove a cascade of unused views that were using auth.loginUser: StudentLogInModal, StudentSignupModal, HourOfCodeView
* Also remove auth.createUser
Use selected hero in Course mode play
Show selected hero on Courses (in progress)
Add hero select modal
Use short names, only show warriors
Use box-shadow instead of borders
Add tests for HeroSelectModal
Refactor modal opening test
Address code review feedback