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/runner/vapor.go

@@ -1,14 +1,14 @@
 package runner
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "vapor",
 		Description: "Vapor Toolbox (Server-side Swift web framework)",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "build", Description: "Builds an app in the console"},
 			{Name: "new", Description: "Generates a new app"},
 			{Name: "name", Description: "Name of project and folder"},
@@ -21,7 +21,7 @@ func init() {
 			{Name: "update", Description: "Updates Supervisor entry for current project"},
 			{Name: "xcode", Description: "Opens an app in Xcode"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--template", Description: "The URL of a Git repository to use as a template"},
 			{Name: "--branch", Description: "Template repository branch to use"},
 			{Name: "--output", Description: "The directory to place the new project in"},