[CLC-1676] Copy assets into public web directory
Merge pull request #1296 from yuhunglin/CLC-1676-copy

[CLC-1676] Copy assets into public web directory
CLC-2173 Gems for Canvas embedded tool support
- openssl is now included in JRuby and should not be explicitly included
- omniauth-cas has become stricter about "host" configuration
CLC-2173 Basic LTI app provider support
CLC-2173 Canvas embedded official roster, server-side
CLC-2173 Canvas embedded official roster, extremely rough client-side start