resources: Make resource kind and baseuid fields public

This is required if we're going to have out of package resources. In
particular for third party packages, and also for if we decide to split
out each resource into a separate sub package.

docs/resource-guide.md

@@ -80,7 +80,7 @@ work, and finish by calling the `Init` method of the base resource.
 ```golang
 // Init initializes the Foo resource.
 func (obj *FooRes) Init() error {
-	obj.BaseRes.kind = "foo" // must lower case resource kind
+	obj.BaseRes.Kind = "foo" // must lower case resource kind
 	// run the resource specific initialization, and error if anything fails
 	if some_error {
 		return err // something went wrong!
@@ -516,7 +516,7 @@ This can _only_ be done inside of the `CheckApply` function!
 ```golang
 // inside CheckApply, probably near the top
 if val, exists := obj.Recv["SomeKey"]; exists {
-	log.Printf("SomeKey was sent to us from: %s[%s].%s", val.Res.Kind(), val.Res.GetName(), val.Key)
+	log.Printf("SomeKey was sent to us from: %s[%s].%s", val.Res.GetKind(), val.Res.GetName(), val.Key)
 	if val.Changed {
 		log.Printf("SomeKey was just updated!")
 		// you may want to invalidate some local cache