Set-up CircleCI builds

Godeps/_workspace/src/github.com/samalba/dockerclient/auth.go

@@ -0,0 +1,21 @@
+package dockerclient
+
+import (
+	"bytes"
+	"encoding/base64"
+	"encoding/json"
+)
+
+// AuthConfig hold parameters for authenticating with the docker registry
+type AuthConfig struct {
+	Username string `json:"username,omitempty"`
+	Password string `json:"password,omitempty"`
+	Email    string `json:"email,omitempty"`
+}
+
+// encode the auth configuration struct into base64 for the X-Registry-Auth header
+func (c *AuthConfig) encode() string {
+	var buf bytes.Buffer
+	json.NewEncoder(&buf).Encode(c)
+	return base64.URLEncoding.EncodeToString(buf.Bytes())
+}