Two small fixes in the sfPropelPlugin for newer PHP versions

I'v patched the sfPropelPlugin for newer versions of PHP that have deprecated mysql_escape_string
This has to do with this strict warning: PHP Strict standards:  Declaration of UnixFileSystem::getBooleanAttributes() should be compatible with FileSystem::getBooleanAttributes($f) in code/lib/vendor/symfony/symfony1/lib/plugins/sfPropelPlugin/lib/vendor/phing/system/io/UnixFileSystem.php on line 278 during generation of the models yes.