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/cordova.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:        "cordova",
 		Description: "Print out the version of your cordova-cli install",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "create", Description: "Create a project"},
 			{Name: "help", Description: "Get help for a command"},
 			{Name: "telemetry", Description: "Turn telemetry collection on or off"},
@@ -35,7 +35,7 @@ func init() {
 			{Name: "serve", Description: "Run project with a local webserver (including prepare)"},
 			{Name: "port", Description: "Port to use for local web server"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-d", Description: "Print out the version of your cordova-cli install"},
 			{Name: "--no-update-notifier", Description: "Will disable updates check"},
 			{Name: "--nohooks", Description: "Suppress executing hooks (taking RegExp hook patterns as parameters)"},