refactor(commands): separate commands and its core into two folders (#32)

- I think it would be better if one for commands only, one for the spec
handling core logic so people won't be confused by the core logic inside
the commands folder (cleaner I guess)
- Regen docs

commands/ops/helm.go

@@ -1,14 +1,14 @@
 package ops
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "helm",
 		Description: "The Helm package manager for Kubernetes",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "completion", Description: "Generate autocompletion scripts for the specified shell"},
 			{Name: "bash", Description: "Generate autocompletion script for bash"},
 			{Name: "fish", Description: "Generate autocompletion script for fish"},
@@ -58,7 +58,7 @@ func init() {
 			{Name: "version", Description: "Print the client version information"},
 			{Name: "help", Description: "Help about any command"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--no-descriptions", Description: "Disable completion descriptions"},
 			{Name: "--starter", Description: "The name or absolute path to Helm starter scaffold"},
 			{Name: "--keyring", Description: "Keyring containing public keys"},