Initial QSfera import

Server/vendor/github.com/toorop/go-dkim/README.md

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+# go-dkim
+DKIM package for Golang
+
+[![GoDoc](https://godoc.org/github.com/toorop/go-dkim?status.svg)](https://godoc.org/github.com/toorop/go-dkim)
+
+## Getting started
+
+### Install
+```
+ 	go get github.com/toorop/go-dkim
+```
+Warning: you need to use Go 1.4.2-master or 1.4.3 (when it will be available)
+see https://github.com/golang/go/issues/10482 fro more info.
+
+### Sign email
+
+```go
+import (
+	dkim "github.com/toorop/go-dkim"
+)
+
+func main(){
+	// email is the email to sign (byte slice)
+	// privateKey the private key (pem encoded, byte slice )	
+	options := dkim.NewSigOptions()
+	options.PrivateKey = privateKey
+	options.Domain = "mydomain.tld"
+	options.Selector = "myselector"
+	options.SignatureExpireIn = 3600
+	options.BodyLength = 50
+	options.Headers = []string{"from", "date", "mime-version", "received", "received"}
+	options.AddSignatureTimestamp = true
+	options.Canonicalization = "relaxed/relaxed"
+	err := dkim.Sign(&email, options)
+	// handle err..
+
+	// And... that's it, 'email' is signed ! Amazing© !!!
+}
+```
+
+### Verify
+```go
+import (
+	dkim "github.com/toorop/go-dkim"
+)
+
+func main(){
+	// email is the email to verify (byte slice)
+	status, err := Verify(&email)
+	// handle status, err (see godoc for status)
+}
+```
+
+## Todo
+
+- [ ] handle z tag (copied header fields used for diagnostic use)