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/sys/fastlane.go

@@ -1,14 +1,14 @@
 package sys
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "fastlane",
 		Description: "Helps you with your initial fastlane setup",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "init", Description: "Helps you with your initial fastlane setup"},
 			{Name: "swift", Description: "Fastlane configuration written in Swift (Beta). Swift setup is still in beta"},
 			{Name: "appleID", Description: "Your Apple ID"},
@@ -34,7 +34,7 @@ func init() {
 			{Name: "update_fastlane", Description: "Update fastlane to the latest release"},
 			{Name: "update_plugins", Description: "Update all plugin dependencies"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-u", Description: "Only iOS projects Your Apple ID"},
 			{Name: "-f", Description: "Overwrite the existing README.md in the ./fastlane folder"},
 			{Name: "-c", Description: "Add custom command(s) for which tab auto complete should be enabled too"},