Revert "Removed unused classes from calendar table cells"
Revert "Removed unused classes from calendar table cells"

These classes are used by tests. Reverting for now; there may be a better
solution.

This reverts commit 105d3d5b363b60499b0fee31193f07647bbafdd8.

alphagov/calendars,alphagov/calendars,ministryofjustice/calendars,alphagov/calendars,ministryofjustice/calendars,alphagov/calendars