start to split into node commonjs style modules

- no longer is the global Bitcoin used for modules
- cleaner and more maintainable code
- add more tests

test/address.js

@@ -0,0 +1,46 @@
+var assert = require('assert');
+var Address = require('../').Address;
+
+test('string', function() {
+    var addr = '18fN1QTGWmHWCA9r2dyDH6FbMEyc7XHmQQ';
+    assert.equal((new Address(addr)).toString(), addr);
+});
+
+test('valid', function() {
+    function validate(addr, type) {
+        assert.ok(Address.validate(addr, type));
+    };
+
+    validate('1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa');
+    validate('1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa', 'prod');
+    validate('mzBc4XEFSdzCDcTxAgf6EZXgsZWpztRhef');
+    validate('mzBc4XEFSdzCDcTxAgf6EZXgsZWpztRhef', 'testnet');
+
+    validate('12KYrjTdVGjFMtaxERSk3gphreJ5US8aUP');
+    validate('12QeMLzSrB8XH8FvEzPMVoRxVAzTr5XM2y');
+    validate('1oNLrsHnBcR6dpaBpwz3LSwutbUNkNSjs');
+    validate('1SQHtwR5oJRKLfiWQ2APsAd9miUc4k2ez');
+    validate('116CGDLddrZhMrTwhCVJXtXQpxygTT1kHd');
+
+    // p2sh addresses
+    validate('3NJZLcZEEYBpxYEUGewU4knsQRn1WM5Fkt');
+    validate('3NJZLcZEEYBpxYEUGewU4knsQRn1WM5Fkt', 'prod');
+    validate('2MxKEf2su6FGAUfCEAHreGFQvEYrfYNHvL7');
+    validate('2MxKEf2su6FGAUfCEAHreGFQvEYrfYNHvL7', 'testnet');
+});
+
+
+test('invalid', function() {
+    function invalid(addr, type) {
+        assert.ok(!Address.validate(addr, type));
+    };
+
+    invalid('');
+    invalid('mzBc4XEFSdzCDcTxAgf6EZXgsZWpztRhe');
+    invalid('1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa', 'testnet');
+    invalid('mzBc4XEFSdzCDcTxAgf6EZXgsZWpztRhef', 'prod');
+
+    // invalid base58 string
+    invalid('%%@');
+});
+