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/circleci.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:        "circleci",
 		Description: "CircleCI CLI",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "completion", Description: "Generate shell completion scripts"},
 			{Name: "bash", Description: "Generate bash completion scripts"},
 			{Name: "zsh", Description: "Generate zsh completion scripts"},
@@ -60,7 +60,7 @@ func init() {
 			{Name: "runner", Description: "Operate on runners"},
 			{Name: "instance", Description: "Operate on runner instances"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--private", Description: "Show metadata of an orb"},
 			{Name: "-u", Description: "Include uncertified orbs"},
 			{Name: "--input", Description: "Path to input file, i.e. ./.circleci/config.yml"},