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/convert.js

@@ -0,0 +1,24 @@
+var assert = require('assert');
+var conv = require('../').convert;
+
+var bytesToHex = conv.bytesToHex;
+var hexToBytes = conv.hexToBytes;
+
+test('bytesToHex', function() {
+    assert.equal(bytesToHex([0, 1, 2, 255]), '000102ff');
+});
+
+test('hexToBytes', function() {
+    assert.deepEqual(hexToBytes('000102ff'), [0, 1, 2, 255]);
+});
+
+test('bytesToHex - hexToBytes', function() {
+    var bytes = [];
+    for (var i=0 ; i<256 ; ++i) {
+        bytes.push(i);
+    }
+
+    var hex = bytesToHex(bytes);
+    assert.equal(hex.length, 512);
+    assert.deepEqual(hexToBytes(hex), bytes);
+});