Implemented support for running triggers with binpkgs.

Also the following changes were made:
 * Added an info-files trigger, to (un)register info files.
 * xbps-base-dirs: it's responsible to install triggers on destdir.

--HG--
extra : convert_revision : 8d707053616f38d2b5beef7cf28e1bc4a66812b8

templates/kernel/INSTALL

@@ -1,12 +1,7 @@
-#!/bin/sh -e
-
-export PATH="/bin:/sbin:/usr/bin:/usr/sbin"
-
-# $1 = chrootdir
-# $2 = action
-# $3 = pkgname
-# $4 = version
-
+#
+# This scripts creates the initramfs for the newly installed
+# kernel package.
+#
 case "$2" in
 pre)
 	;;
@@ -39,5 +34,3 @@ post)
 	${umntsys_cmd}
 	;;
 esac
-
-exit 0