pkg: hide it by moving to _pkg.dev

The idea here is to preserve the history of `dev` branch development and its
code when merging with the `master`. Later this code could be moved into the
masters code where appropriate.

_pkg.dev/wire/payload/transaction/contract.go

@@ -0,0 +1,28 @@
+package transaction
+
+import (
+	"github.com/CityOfZion/neo-go/pkg/wire/payload/transaction/types"
+	"github.com/CityOfZion/neo-go/pkg/wire/payload/transaction/version"
+	"github.com/CityOfZion/neo-go/pkg/wire/util"
+)
+
+//Contract represents a contract transaction on the neo network
+type Contract struct {
+	*Base
+}
+
+//NewContract returns a contract transaction
+func NewContract(ver version.TX) *Contract {
+	basicTrans := createBaseTransaction(types.Contract, ver)
+
+	contract := &Contract{
+		basicTrans,
+	}
+	contract.encodeExclusive = contract.encodeExcl
+	contract.decodeExclusive = contract.decodeExcl
+	return contract
+}
+
+func (c *Contract) encodeExcl(bw *util.BinWriter) {}
+
+func (c *Contract) decodeExcl(br *util.BinReader) {}