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/vault.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:        "vault",
 		Description: "Display help",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "read", Description: "Reads data from Vault at the given path"},
 			{Name: "write", Description: "Writes data from Vault at the given path"},
 			{Name: "delete", Description: "Deletes secrets and configuration from Vault at the given path"},
@@ -38,7 +38,7 @@ func init() {
 			{Name: "ssh", Description: "Establishes an SSH connection with the target machine"},
 			{Name: "version-history", Description: "Prints the version history of the target Vault server"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--help", Description: "Display help"},
 			{Name: "-address", Description: "Key to unlock a namespace API lock. The default is (not set)"},
 			{Name: "-wrap-ttl", Description: "Exit the vault server if the vault core is shutdown. The default is false"},