xdg: adding a XDG Base Directory Specification.

diff --git a/extra/xdg/authors.txt b/extra/xdg/authors.txt
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+John Benediktsson

diff --git a/extra/xdg/summary.txt b/extra/xdg/summary.txt
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+XDG Base Directory Specification

diff --git a/extra/xdg/xdg.factor b/extra/xdg/xdg.factor
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+! Copyright (C) 2015 John Benediktsson
+! See http://factorcode.org/license.txt for BSD license
+
+USING: environment sequences splitting ;
+
+IN: xdg
+
+! http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
+
+: xdg-data-home ( -- path )
+    "XDG_DATA_HOME" os-env [ "~/.local/share" ] when-empty ;
+
+: xdg-config-home ( -- path )
+    "XDG_CONFIG_HOME" os-env [ "~/.config" ] when-empty ;
+
+: xdg-cache-home ( -- path )
+    "XDG_CACHE_HOME" os-env [ "~/.cache" ] when-empty ;
+
+: xdg-data-dirs ( -- paths )
+    "XDG_DATA_DIRS" os-env ":" split harvest
+    [ { "/usr/local/share" "/usr/share" } ] when-empty ;
+
+: xdg-config-dirs ( -- paths )
+    "XDG_CONFIG_DIRS" os-env ":" split harvest
+    [ { "/etc/xdg" } ] when-empty ;
+
+: xdg-runtime-dir ( -- path/f )
+    "XDG_RUNTIME_DIR" os-env ;
+    ! TODO: check runtime secure permissions