Carve out initial application structure

This changeset defines the application structure to be used for the http side
of the new registry. The main components are the App and Context structs. The
App context is instance global and manages global configuration and resources.
Context contains request-specific resources that may be created as a by-product
of an in-flight request.

To latently construct per-request handlers and leverage gorilla/mux, a dispatch
structure has been propped up next to the main handler flow. Without this, a
router and all handlers need to be constructed on every request. By
constructing handlers on each request, we ensure thread isolation and can
carefully control the security context of in-flight requests. There are unit
tests covering this functionality.

images.go

@@ -0,0 +1,46 @@
+package registry
+
+import (
+	"net/http"
+
+	"github.com/gorilla/handlers"
+)
+
+// imageManifestDispatcher takes the request context and builds the
+// appropriate handler for handling image manifest requests.
+func imageManifestDispatcher(ctx *Context, r *http.Request) http.Handler {
+	imageManifestHandler := &imageManifestHandler{
+		Context: ctx,
+		Tag:     ctx.vars["tag"],
+	}
+
+	imageManifestHandler.log = imageManifestHandler.log.WithField("tag", imageManifestHandler.Tag)
+
+	return handlers.MethodHandler{
+		"GET":    http.HandlerFunc(imageManifestHandler.GetImageManifest),
+		"PUT":    http.HandlerFunc(imageManifestHandler.PutImageManifest),
+		"DELETE": http.HandlerFunc(imageManifestHandler.DeleteImageManifest),
+	}
+}
+
+// imageManifestHandler handles http operations on image manifests.
+type imageManifestHandler struct {
+	*Context
+
+	Tag string
+}
+
+// GetImageManifest fetches the image manifest from the storage backend, if it exists.
+func (imh *imageManifestHandler) GetImageManifest(w http.ResponseWriter, r *http.Request) {
+
+}
+
+// PutImageManifest validates and stores and image in the registry.
+func (imh *imageManifestHandler) PutImageManifest(w http.ResponseWriter, r *http.Request) {
+
+}
+
+// DeleteImageManifest removes the image with the given tag from the registry.
+func (imh *imageManifestHandler) DeleteImageManifest(w http.ResponseWriter, r *http.Request) {
+
+}