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/lpass.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:        "lpass",
 		Description: "Command line interface for LastPass",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "login", Description: "Log in to LastPass"},
 			{Name: "USERNAME", Description: "LastPass account username (email address)"},
 			{Name: "logout", Description: "Log out of LastPass"},
@@ -47,7 +47,7 @@ func init() {
 			{Name: "limit", Description: "Manipulate LastPass Shared Folder access"},
 			{Name: "sites", Description: "LastPass sites to manipulate"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--trust", Description: "Subsequent logins will not require multifactor authentication"},
 			{Name: "--plaintext-key", Description: "Save decryption key to the hard disk in plaintext"},
 			{Name: "--force", Description: "Skip user confirmation"},