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

src/index.js

@@ -0,0 +1,46 @@
+// Bit-wise rotate left
+var rotl = function (n, b) {
+    return (n << b) | (n >>> (32 - b));
+};
+
+// Bit-wise rotate right
+var rotr = function (n, b) {
+    return (n << (32 - b)) | (n >>> b);
+};
+
+// Swap big-endian to little-endian and vice versa
+var endian = function (n) {
+    // If number given, swap endian
+    if (n.constructor == Number) {
+        return rotl(n,  8) & 0x00FF00FF | rotl(n, 24) & 0xFF00FF00;
+    }
+
+    // Else, assume array and swap all items
+    for (var i = 0; i < n.length; i++) {
+        n[i] = endian(n[i]);
+    }
+    return n;
+}
+
+module.exports = {
+    Address: require('./address'),
+    Key: require('./eckey'),
+    BigInteger: require('./jsbn/jsbn'),
+    Script: require('./script'),
+    Opcode: require('./opcode'),
+    Transaction: require('./transaction').Transaction,
+    TransactionIn: require('./transaction').TransactionIn,
+    TransactionOut: require('./transaction').TransactionOut,
+    ECPointFp: require('./jsbn/ec').ECPointFp,
+    Wallet: require('./wallet'),
+
+    ecdsa: require('./ecdsa'),
+
+    // base58 encoding/decoding to bytes
+    base58: require('./base58'),
+
+    // conversions
+    convert: require('./convert'),
+
+    endian: endian
+}