Grand test fixup (#138)

* start fixing up tests

* fix up tests + automate with drone

* fiddle with linting

* messing about with drone.yml

* some more fiddling

* hmmm

* add cache

* add vendor directory

* verbose

* ci updates

* update some little things

* update sig

vendor/github.com/tmthrgd/go-hex/hex_other.go

@@ -0,0 +1,36 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !amd64 gccgo appengine
+
+package hex
+
+// RawEncode encodes src into EncodedLen(len(src))
+// bytes of dst.  As a convenience, it returns the number
+// of bytes written to dst, but this value is always EncodedLen(len(src)).
+// RawEncode implements hexadecimal encoding for a given alphabet.
+func RawEncode(dst, src, alpha []byte) int {
+	if len(alpha) != 16 {
+		panic("invalid alphabet")
+	}
+
+	encodeGeneric(dst, src, alpha)
+	return len(src) * 2
+}
+
+// Decode decodes src into DecodedLen(len(src)) bytes, returning the actual
+// number of bytes written to dst.
+//
+// If Decode encounters invalid input, it returns an error describing the failure.
+func Decode(dst, src []byte) (int, error) {
+	if len(src)%2 == 1 {
+		return 0, errLength
+	}
+
+	if n, ok := decodeGeneric(dst, src); !ok {
+		return 0, InvalidByteError(src[n])
+	}
+
+	return len(src) / 2, nil
+}