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/base58.js

@@ -0,0 +1,15 @@
+var assert = require('assert');
+var base58 = require('../').base58;
+var conv = require('../').convert;
+
+test('decode base58', function() {
+    var enc = '5HueCGU8rMjxEXxiPuD5BDku4MkFqeZyd4dZ1jvhTVqvbTLvyTJ';
+    var hex = '800c28fca386c7a227600b2fe50b7cae11ec86d3bf1fbe471be89827e19d72aa1d507a5b8d';
+    assert.deepEqual(base58.decode(enc), conv.hexToBytes(hex));
+});
+
+test('encode base58', function() {
+    var enc = '5HueCGU8rMjxEXxiPuD5BDku4MkFqeZyd4dZ1jvhTVqvbTLvyTJ';
+    var hex = '800c28fca386c7a227600b2fe50b7cae11ec86d3bf1fbe471be89827e19d72aa1d507a5b8d';
+    assert.equal(base58.encode(conv.hexToBytes(hex)), enc);
+});