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Adapt code to make it compatible with PHP 5.4

Only show file exists warning in very verbose mode

Merge branch 'master' of github.com:php-composter/php-composter

Hooks in `extra` key are regrouped under a new `php-composter-hooks` …

…key.

Update change log

Update change log.

Pass `$hook` & `$root` variables to action.

Initial commit.