Merge pull request #157 from kilpatty/export-covenant

exports: export Covenant along with other primitives

Author: chjj

lib/hsd.js

@@ -95,6 +95,7 @@ hsd.define('primitives', './primitives');
 hsd.define('Address', './primitives/address');
 hsd.define('Block', './primitives/block');
 hsd.define('Coin', './primitives/coin');
+hsd.define('Covenant', './primitives/covenant');
 hsd.define('Headers', './primitives/headers');
 hsd.define('Input', './primitives/input');
 hsd.define('InvItem', './primitives/invitem');