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/browser_sync.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:        "browser-sync",
 		Description: "Keep multiple browsers & devices in sync when building websites",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "start", Description: "Start Browsersync"},
 			{Name: "init", Description: "Create a configuration file"},
 			{Name: "reload", Description: "Send a reload event over HTTP protocol"},
 			{Name: "recipe", Description: "Generate the files for a recipe"},
 			{Name: "ls", Description: "List recipes"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--version", Description: "Show version number"},
 			{Name: "--help", Description: "Show help"},
 			{Name: "-s", Description: "Run a Local server (uses your cwd as the web root)"},