Move ko commands to pkg/commands (#29)

* Move commands to pkg/commands and split into files.

pkg/commands/commands.go

@@ -0,0 +1,30 @@
+// Copyright 2018 Google LLC All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package commands
+
+import (
+	"github.com/spf13/cobra"
+)
+
+// AddKubeCommands augments our CLI surface with a passthru delete command, and an apply
+// command that realizes the promise of ko, as outlined here:
+//    https://github.com/google/go-containerregistry/issues/80
+func AddKubeCommands(topLevel *cobra.Command) {
+	addDelete(topLevel)
+	addApply(topLevel)
+	addResolve(topLevel)
+	addPublish(topLevel)
+	addRun(topLevel)
+}