Query and bug fixes (#110)

* Fix queries and bugs

* Fix issues from rebasing

* Fix rpc query address

utils/int.go

@@ -0,0 +1,19 @@
+package utils
+
+import "math/big"
+
+// MarshalBigInt marshalls big int into text string for consistent encoding
+func MarshalBigInt(i *big.Int) string {
+	bz, err := i.MarshalText()
+	if err != nil {
+		panic(err)
+	}
+	return string(bz)
+}
+
+// UnmarshalBigInt unmarshalls string from *big.Int
+func UnmarshalBigInt(s string) (*big.Int, error) {
+	ret := new(big.Int)
+	err := ret.UnmarshalText([]byte(s))
+	return ret, err
+}