starting Address idiom changes

Address.js

@@ -10,10 +10,12 @@ Address.parent = parent;
 parent.applyEncodingsTo(Address);
 
 Address.prototype.validate = function() {
+  var answer;
   this.doAsBinary(function() {
     Address.super(this, 'validate', arguments);
-    if(this.data.length !== 21) throw new Error('invalid data length');
+    answer = (this.data.length === 21);
   });
+  return answer;
 };
 
 module.exports = require('soop')(Address);

test/test.Address.js

@@ -26,7 +26,11 @@ describe('Address', function() {
     var b = new Address('11111111111111111111111111122222234');
     a.validate.bind(a).should.not.throw(Error);
     m.validate.bind(m).should.not.throw(Error);
-    b.validate.bind(b).should.throw(Error);
+    b.validate.bind(b).should.not.throw(Error);
+
+    a.validate().should.equal(true);
+    m.validate().should.equal(true);
+    b.validate().should.equal(false);
   });
 });