add LICENSE, README and release script

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+=========
+porticron
+=========
+
+:Author: `Benedikt Böhm <bb@xnull.de>`_
+:Version: 0.2.1
+:Web: http://bb.xnull.de/projects/porticron/
+:Source: http://git.xnull.de/gitweb/?p=porticron.git
+:Download: http://bb.xnull.de/projects/porticron/dist/
+
+porticron is a simple shell script for portage similar to apticron for debian.
+It is called from cron to sync your portage tree and send any pending upgrade
+via email.
+
+Installation
+============
+
+porticron is available via portage:
+::
+
+  emerge porticron
+
+Configuration
+=============
+
+The configuration for porticron is located at ``/etc/porticron.conf``. You can set the following options:
+
+SYNC_CMD
+  The command porticron should use to synchronize your portage tree. Defaults to ``/usr/bin/emerge --sync``. Set this to ``/bin/true`` if your portage tree is mounted read-only (e.g. via nfs).
+
+UPGRADE_OPTS
+  Command-line options that should be passed to emerge while scanning for pending upgrades. Defaults to ``--deep --update``.
+
+RCPT
+  Recipient of notification mails. Defaults to ``root@$(hostname -f)``
+
+SENDMAIL
+  Path to sendmail binary. Defaults to ``/usr/sbin/sendmail``
+
+Example
+=======
+
+An sample of an upgrade notification looks like this:
+::
+
+  porticron report [Tue, 09 Dec 2008 05:07:06 +0100]
+  ========================================================================
+
+  porticron has detected that some packages need upgrading:
+
+      [ebuild     U ] sys-libs/timezone-data-2008i [2008g-r1]
+      [ebuild     U ] sys-apps/man-pages-3.14 [3.12]
+      [ebuild     U ] sys-process/htop-0.8.1-r1 [0.8.1]
+      [ebuild     U ] sys-apps/util-linux-2.14.1 [2.13.1.1]
+      [ebuild     U ] app-portage/elogv-0.7.2 [0.7.1]
+      [ebuild     U ] sys-apps/busybox-1.11.3 [1.11.1]
+      [ebuild     U ] app-admin/eselect-1.0.11-r1 [1.0.10]
+
+  ========================================================================
+
+  You can perform the upgrade by issuing the command:
+
+      emerge --deep --update world
+
+  as root on foo.example.com
+
+  It is recommended that you pretend the upgrade first to confirm that
+  the actions that would be taken are reasonable. The upgrade may be
+  pretended by issuing the command:
+
+      emerge --deep --update --pretend world