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/hugo.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:        "hugo",
 		Description: "The world's fastest framework for building websites",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "check", Description: "Contains some verification checks"},
 			{Name: "ulimit", Description: "Check system ulimit settings"},
 			{Name: "config", Description: "Print the site configuration"},
@@ -48,7 +48,7 @@ func init() {
 			{Name: "server", Description: "A high performance webserver"},
 			{Name: "version", Description: "Print the version number of Hugo"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-h", Description: "Config file (default is path/config.yaml|json|toml)"},
 			{Name: "--configDir", Description: "Config dir (default 'config')"},
 			{Name: "--debug", Description: "Debug output (default false)"},