Add exclude paths configuration for annotation driver

[jankonas]

Adds configuration option for excluding some paths from annotation driver search.

This is useful when you have some executable code in searched directories.

For example when you have whole %appDir% in paths, you can exclude %appDir%/bootstrap.php and other files, so their code is not executed when the annotation driver parses annotations. Otherwise it would be, as the parsed files are included inside AnnotationDriver::getAllClassNames method by require_once function.

[f3l1x]

Thank you.