CLC-4477 - scss-lint gem update (0.30.0) has made Travis unhappy (e.g., Nesting rules violated)

https://jira.ets.berkeley.edu/jira/browse/CLC-4477
Merge pull request #3122 from christianv/CLC-4477

CLC-4477 - scss-lint gem update (0.30.0) has made Travis unhappy (e.g., Nesting rules violated)