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/elm_review.go

@@ -1,20 +1,20 @@
 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:        "elm-review",
 		Description: "Prints a single JSON object",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "init", Description: "Initialize Elm Review in this directory"},
 			{Name: "suppress", Description: "Generate suppression files for rules that report many errors"},
 			{Name: "new-package", Description: "Creates an new project aimed to contain rules and to be published later"},
 			{Name: "new-rule", Description: "Adds a new rule to your review configuration or review package"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--help", Description: "Show help for elm-review init"},
 			{Name: "--config", Description: "Specify the path to the elm compiler"},
 			{Name: "--check-after-tests", Description: "Checks whether there are uncommitted suppression files"},