Fix parsing uint64 fields with values >= 2^32

lib/common.js

@@ -286,7 +286,7 @@ PaymentProtocol.prototype.get = function(key) {
   //protobuf supports longs, javascript naturally does not
   //convert longs (see long.js, e.g. require('long')) to Numbers
   if (typeof v.low !== 'undefined' && typeof v.high !== 'undefined') {
-    return v.toInt();
+    return v.toNumber();
   }
 
   if (typeof v.toBuffer !== 'undefined') {

test/index.js

@@ -128,6 +128,13 @@ describe('PaymentProtocol', function() {
       output.message.get('amount').toInt().should.equal(20);
     });
 
+    it('should be able to get and set amount >= 2^32 through "PaymentProtocol"', function () {
+      var paypro = new PaymentProtocol();
+      paypro.makeOutput();
+      paypro.set('amount', 4294967296);
+      paypro.get('amount').should.equal(4294967296);
+    });
+
   });
 
   describe('#PaymentDetails', function() {