Let the parser ignore .* (hidden) files

When generating models from yml files starting with a `.' such as temporary files from certain editors and meta files from OS X are also parsed by the importer. I do not see any reasons too include these hidden files in parsing as they are hidden for a purpose. And there would be no point in deliberately using hidden files for your config files.

Also see:
http://blog.rajatpandit.com/2009/08/23/doctrine_parser_exception-fail-some-error-message/
and
http://alessandrovermeulen.me/2010/01/01/doctrine-unable-to-parse-string-unable-to-parse-line-0/