I'd like to move in the direction of namespacing JavaScript.  I know we haven't done that yet for application.js, but let's start it here.

Can you put this all in a UsersPage namespace?  E.g.

    var UsersPage = {
      removeFields: function(link) { ... },
      addFields: function(link, association, content) { ... },
    };

 In addition, we name JavaScript functions and variables with kneelingCamelCase.