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/js/quasar.go

@@ -1,21 +1,21 @@
 package js
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "quasar",
 		Description: "Quasar Framework CLI",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "create", Description: "Create a new Quasar project"},
 			{Name: "project-name", Description: "Name of the project"},
 			{Name: "info", Description: "Gather environment information for issue reporting"},
 			{Name: "upgrade", Description: "Upgrade Quasar Framework packages"},
 			{Name: "serve", Description: "Start development server"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-h", Description: "Output usage information"},
 			{Name: "--kit", Description: "Use specific starter kit"},
 			{Name: "--branch", Description: "Use specific branch of the starter kit"},