Add vendor dir (#16) (#4)

* Add vendor dir so builds dont require dep

* Pin specific version go-eth version

vendor/github.com/btcsuite/btcd/txscript/log.go

@@ -0,0 +1,43 @@
+// Copyright (c) 2013-2015 The btcsuite developers
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+package txscript
+
+import (
+	"github.com/btcsuite/btclog"
+)
+
+// log is a logger that is initialized with no output filters.  This
+// means the package will not perform any logging by default until the caller
+// requests it.
+var log btclog.Logger
+
+// The default amount of logging is none.
+func init() {
+	DisableLog()
+}
+
+// DisableLog disables all library log output.  Logging output is disabled
+// by default until UseLogger is called.
+func DisableLog() {
+	log = btclog.Disabled
+}
+
+// UseLogger uses a specified Logger to output package logging info.
+func UseLogger(logger btclog.Logger) {
+	log = logger
+}
+
+// LogClosure is a closure that can be printed with %v to be used to
+// generate expensive-to-create data for a detailed log level and avoid doing
+// the work if the data isn't printed.
+type logClosure func() string
+
+func (c logClosure) String() string {
+	return c()
+}
+
+func newLogClosure(c func() string) logClosure {
+	return logClosure(c)
+}