Fix a warning in case the book has no tag or author
getFilterString should be static. Reported by Goner
Upgrade php-epub-meta from upstream. Should fix coverpath on Windows. Reported by Mario
Update from upstream again
To avoid all problems with php-epub-meta working on windows and some
version of Linux. Remove the directory so that include are simple.

--HG--
rename : php-epub-meta/LICENSE => LICENSE_php-epub-meta
rename : php-epub-meta/epub.php => epub.php
rename : php-epub-meta/tbszip.php => tbszip.php
Prepare next release