Add empty read method to trust packet. Otherwise import of key with a trust packet will fail. Trust packets are ignored and filtered out by the Key class.

src/packet/trust.js

@@ -13,3 +13,12 @@ var enums = require('../enums.js');
 function Trust() {
   this.tag = enums.packet.trust;
 }
+
+/**
+ * Parsing function for a trust packet (tag 12).
+ * Currently empty as we ignore trust packets
+ * @param {String} byptes payload of a tag 12 packet
+ */
+Trust.prototype.read = function (bytes) {
+
+};