Add chgrp/chmod to prevent error on initial setup

Without this fix, the initial environment broken due to the web server not
being able to write to the config.php file, which requires the user to
ssh into the instance and fix the permissions.
Clarify charm policy and update verbiage for charm proof
Merge pull request #140 from marcoceppi/patch-proof-info

Clarify charm policy and update verbiage for charm proof
Patch Vanilla to allow DB Host from config.php

It seems that if you don't apply this patch, the initial setup screen from the
tutorial ignores the DB Host variable and always uses 'localhost'.
Added 1.20.5 release notes.
Update howto-backup-restore.md

Typo fix.
Merge pull request #142 from sinzui/1.20.5-release

Added 1.20.5 release notes.
Merge pull request #141 from mcgrathd/authors-charm-writing-dblocalhostfix

Patch Vanilla to allow DB Host from config.php
Merge pull request #139 from mcgrathd/authors-charm-writing-permgrpfix

Add chgrp/chmod to prevent error on initial setup