code: function obfusicate(str) {
          if (!angular.isString(str)) {
              // return null so we don't show any old random non-string thing
              return null;
          }
          return str.split('').map(function (c) { return '*'; }).join('');
      }
docs: Convert a string into a bunch of '*' of the same length
  @param str
  @returns {string}