CLC-2128 Create user whitelist table and make it administrable
CLC-2128 Pseudo-code sketch of can-login check
[CLC-2111] Spare extra object allocation
CLC-2127 Implement user whitelist in front-end and session controller
CLC-2127 Add TODO
Merge pull request #1270 from yuhunglin/CLC-2111

[CLC-2111] Spare extra object allocation
Merge pull request #1271 from ctweney/clc-2128

CLC-2127 User whitelist implementation
NOJIRA ominauth-cas has gotten stricter about "host"
Our current host+path settings will trigger URI parsing errors
NOJIRA openssl now included in jruby
If explicitly included, may spew warnings about "already initialized constant"
CANVAS-75 Add LTI Provider support
CANVAS-75 Simple tool to exercise LTI code - WORK-IN-PROGRESS
CANVAS-75 LTI embedded view - WORK-IN-PROGRESS
CANVAS-75 LTI embedded view - WORK-IN-PROGRESS