Align number fields to the right in tables

Created by: gracewashere

Why?

• It's easiest to read numbers in a table if they're right-aligned

Changes:

• Switch table elements to BEM syntax
  • not sure if this is best practice, because the field elements are not all contained in a single .field div.
  • I like it because on index and show pages, we can reuse the classes, and wrap them in a .field div there.
• Move html_class from instance to class method on Field::Base so we can use the field type to align the table headers.

Tags: #ruby #design