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/pass.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:        "pass",
 		Description: "Pass - stores, retrieves, generates, and synchronizes passwords securely",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "init", Description: "Initialize new password storage and use gpg-id for encryption"},
 			{Name: "gpg-id", Description: "The gpg-id you want to use to encrypt your password store"},
 			{Name: "insert", Description: "Insert a new password into the password store called pass-name"},
@@ -28,7 +28,7 @@ func init() {
 			{Name: "find", Description: "List names of passwords inside the tree that match pass-names"},
 			{Name: "show", Description: "Decrypt and print a password"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--clip", Description: "Copy the password to the clipboard"},
 			{Name: "--qrcode", Description: "Display a QRcode of the password"},
 			{Name: "--help", Description: "Show help for pass"},