This updated hook supports validates each line of the commit message
confirms to the phpBB standards [1], there are two git config options
which adjust the behaviour of the hook. They are:
* phpbb.hooks.commit-msg.fatal: Set to false for the hook to allow
commits with malformed structure, useful if you'll be squashing
or editing the commits later. True is the default value.
* phpbb.hooks.commit-msg.debug: Any integer value greater than 0 will
increase the debugging verbosity of the hook, the default value is 0.
[1] http://wiki.phpbb.com/display/DEV/Git
PHPBB3-9768
