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/ionic.go

@@ -1,14 +1,14 @@
 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:        "ionic",
 		Description: "Target engine (e.g. browser, cordova)",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "completion", Description: "Enables tab-completion for Ionic CLI commands"},
 			{Name: "id", Description: "The Appflow ID of the app to link (e.g. a1b2c3d4)"},
 			{Name: "email", Description: "Your email address"},
@@ -45,7 +45,7 @@ func init() {
 			{Name: "action", Description: "Add, remove, or update a platform; ls, check, or save all project platforms"},
 			{Name: "plugin", Description: "The name of the plugin (corresponds to add and remove)"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--engine", Description: "Target engine (e.g. browser, cordova)"},
 			{Name: "--platform", Description: "Target platform on chosen engine (e.g. ios, android)"},
 			{Name: "--prod", Description: "Flag to use the production configuration"},