CLC-4283 - Update gems: foundation 5.4.5

https://jira.ets.berkeley.edu/jira/browse/CLC-4283
CLC-4283 - Update gems: foundation 5.4.5 - update base CSS

https://jira.ets.berkeley.edu/jira/browse/CLC-4283
CLC-4283 - Update gems: webmock

https://jira.ets.berkeley.edu/jira/browse/CLC-4283
Merge pull request #3048 from christianv/CLC-4283

CLC-4283 - Update gems: foundation 5.4.5 & webmock