CLC-3378 canvas custom: Convert all JS variables to camelCase
https://jira.ets.berkeley.edu/jira/browse/CLC-3378

We need to ignore it in this file since we're accessing Canvas JS:
`window.ENV.current_user_roles`
Merge pull request #2421 from christianv/CLC-3378-canvascustom

CLC-3378 canvas custom: Convert all JS variables to camelCase