resources: Unify resource creation and kind setting

This removes the duplication of the kind string and cleans up things for
resource creation.

resources/pkg.go

@@ -18,7 +18,6 @@
 package resources
 
 import (
-	"encoding/gob"
 	"fmt"
 	"log"
 	"path"
@@ -32,7 +31,6 @@ import (
 
 func init() {
 	RegisterResource("pkg", func() Res { return &PkgRes{} })
-	gob.Register(&PkgRes{})
 }
 
 // PkgRes is a package resource for packagekit.
@@ -67,7 +65,6 @@ func (obj *PkgRes) Validate() error {
 
 // Init runs some startup code for this resource.
 func (obj *PkgRes) Init() error {
-	obj.BaseRes.Kind = "pkg"
 	if err := obj.BaseRes.Init(); err != nil { // call base init, b/c we're overriding
 		return err
 	}