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/serverless.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:        "serverless",
 		Description: "AWS profile to use with the command",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "deploy", Description: "Deploy a Serverless service"},
 			{Name: "info", Description: "Display information about the service"},
 			{Name: "invoke", Description: "Invoke a deployed function"},
@@ -30,7 +30,7 @@ func init() {
 			{Name: "param", Description: "Get/list value of dashboard service output"},
 			{Name: "slstats", Description: "Enable or disable stats"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--aws-profile", Description: "AWS profile to use with the command"},
 			{Name: "--function", Description: "Name of the function"},
 			{Name: "--region", Description: "Region of the service"},