gpg: Add config to ask for the gpg passphrase

In order for emacs to be able to cope with gpg, the following lines
have to be configured in `~/.gnupg/gpg-agent.conf`:

```
pinentry-program /usr/bin/pinentry-tty
allow-loopback-entry
```

.emacs.d/config/gpg.el

@@ -0,0 +1,3 @@
+(use-package pinentry
+             :init
+             (setq epa-pinentry-mode 'loopback))

.emacs.d/init.el

@@ -57,7 +57,7 @@ symbols, which are converted to strings, and suffixed with \".el\"."
   :group 'config-snippets
   :type '(repeat directory))
 
-(setq config-snippets '(base backups calendar dev functions org pass wl))
+(setq config-snippets '(base backups calendar dev functions gpg org pass wl))
 
 (message "Loading\nconfig-snippets: %s\nconfig-snippets-path: %s" config-snippets config-snippet-path)
 (dolist (snippet config-snippets)

.gitignore.d/emacs

@@ -4,6 +4,7 @@
 !/.emacs.d/config/calendar.el
 !/.emacs.d/config/dev.el
 !/.emacs.d/config/functions.el
+!/.emacs.d/config/gpg.el
 !/.emacs.d/config/org.el
 !/.emacs.d/config/pass.el
 !/.emacs.d/config/tramp.el