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/vsce.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:        "vsce",
 		Description: "The Visual Studio Code Extension Manager",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "ls", Description: "Lists all the files that will be published"},
 			{Name: "package", Description: "Packages an extension"},
 			{Name: "publish", Description: "Publishes an extension"},
@@ -22,7 +22,7 @@ func init() {
 			{Name: "search", Description: "Search extension gallery"},
 			{Name: "help", Description: "Display help for command"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--yarn", Description: "Use yarn instead of npm (default inferred from presence of yarn.lock or .yarnrc)"},
 			{Name: "--no-yarn", Description: "Use npm instead of yarn (default inferred from lack of yarn.lock or .yarnrc)"},
 			{Name: "--packagedDependencies", Description: "Select packages that should be published only (includes dependencies)"},