Create snowblock for GPG

Createed a new snowblock for GPG (1) including

* the `gpg.conf` (2) file for the configuration of GPG

References:

  (1) https://gnupg.org
  (2) https://www.gnupg.org/documentation/manuals/gnupg/GPG-Configuration.html

Closes GH-130

snowblocks/gpg/gpg.conf

@@ -0,0 +1,37 @@
+# Copyright (c) 2016-present Arctic Ice Studio <development@arcticicestudio.com>
+# Copyright (c) 2016-present Sven Greb <development@svengreb.de>
+
+# Project:    igloo
+# Repository: https://github.com/arcticicestudio/igloo
+# License:    MIT
+# References:
+#   https://www.gnupg.org/documentation/manuals/gnupg/GPG-Configuration.html
+#   https://wiki.archlinux.org/index.php/GnuPG
+#   gpg(1)
+#   gpg-agent(1)
+
+# Enable the usage of the GPG agent.
+use-agent
+
+# +----------+
+# + Behavior +
+# +----------+
+
+# Disable inclusion of the version string in ASCII armored output.
+no-emit-version
+
+# Disable comment string in clear text signatures and ASCII armored messages.
+no-comments
+
+# Display long key IDs.
+keyid-format 0xlong
+
+# List all keys (or the specified ones) along with their fingerprints.
+with-fingerprint
+
+# +-----------+
+# + Keyserver +
+# +-----------+
+
+# When searching for a key with `--search-keys`, include keys that are marked on the keyserver as revoked.
+keyserver-options include-revoked

snowblocks/gpg/snowblock.json

@@ -0,0 +1,13 @@
+[
+  {
+    "clean": ["~/.gnupg"]
+  },
+  {
+    "link": {
+      "~/.gnupg/gpg.conf": {
+        "create": true,
+        "path": "gpg.conf"
+      }
+    }
+  }
+]