refs #1449 - remove Zend_Filter ... not going to use it in #1442

libs/Zend/Filter.php

libs/Zend/Filter/Alnum.php

libs/Zend/Filter/Alpha.php

libs/Zend/Filter/BaseName.php

libs/Zend/Filter/Boolean.php

libs/Zend/Filter/Callback.php

libs/Zend/Filter/Compress.php

libs/Zend/Filter/Compress/Bz2.php

libs/Zend/Filter/Compress/CompressAbstract.php

libs/Zend/Filter/Compress/CompressInterface.php

libs/Zend/Filter/Compress/Gz.php

libs/Zend/Filter/Compress/Lzf.php

libs/Zend/Filter/Compress/Rar.php

libs/Zend/Filter/Compress/Tar.php

libs/Zend/Filter/Compress/Zip.php

libs/Zend/Filter/Decompress.php

libs/Zend/Filter/Decrypt.php

libs/Zend/Filter/Digits.php

libs/Zend/Filter/Dir.php

libs/Zend/Filter/Encrypt.php