bug fixes (TCP + uint256) and started core part (#14)

* Fixed TCP read + Uint256 reversed array + started on some core pieces

* Disabled some debug output + muted test

* 0.5.0

pkg/util/uint160.go

@@ -0,0 +1,24 @@
+package util
+
+import (
+	"encoding/hex"
+)
+
+const uint160Size = 20
+
+// Uint160 is a 20 byte long unsigned integer.
+type Uint160 [uint160Size]uint8
+
+// ToSlice returns a byte slice of u.
+func (u Uint160) ToSlice() []byte {
+	b := make([]byte, uint160Size)
+	for i := 0; i < uint160Size; i++ {
+		b[i] = byte(u[i])
+	}
+	return b
+}
+
+// String implements the stringer interface.
+func (u Uint160) String() string {
+	return hex.EncodeToString(u.ToSlice())
+}