Remove unused classes & variable.
centered header sizing updates. Fixes 3421
Merge pull request #366 from DFurnes/cleanup

Remove unused classes & variable.
Merge pull request #372 from sbsmith86/centered-modifier-size-update

centered header sizing updates. Fixes 3421
Release v5.3.3
Built assets for v5.3.3
Built style guide for v5.3.3