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/ops/eas.go

@@ -1,14 +1,14 @@
 package ops
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "eas",
 		Description: "Log in with your Expo account",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "account:login", Description: "Log in with your Expo account"},
 			{Name: "account:logout", Description: "Log out"},
 			{Name: "account:view", Description: "Show the username you are logged in as"},
@@ -60,7 +60,7 @@ func init() {
 			{Name: "webhook:delete", Description: "Delete a webhook"},
 			{Name: "ID", Description: "ID of the webhook to delete"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-r", Description: "Refresh cache (ignores displaying instructions)"},
 			{Name: "--json", Description: "Enable JSON output, non-JSON messages will be printed to stderr"},
 			{Name: "--non-interactive", Description: "Run the command in non-interactive mode"},