Refactor of the Go node (#44)

* added headersOp for safely processing headers

* Better handling of protocol messages.

* housekeeping + cleanup tests

* Added more blockchain logic + unit tests

* fixed unreachable error.

* added structured logging for all (node) components.

* added relay flag + bumped version

pkg/core/util.go

@@ -0,0 +1,12 @@
+package core
+
+import "github.com/CityOfZion/neo-go/pkg/util"
+
+// Utilities for quick bootstrapping blockchains. Normally we should
+// create the genisis block. For now (to speed up development) we will add
+// The hashes manually.
+
+func GenesisHashPrivNet() util.Uint256 {
+	hash, _ := util.Uint256DecodeString("996e37358dc369912041f966f8c5d8d3a8255ba5dcbd3447f8a82b55db869099")
+	return hash
+}