Merge pull request #67 from chrox/master

fix bg- and fgcolor support in freetype ffi module
Merge pull request #68 from chrox/master

fix hyphens detection when reflowing pdf/djvu pages
update libk2pdfopt for multithread hinting
temporarily disable ffi blitbuffer module
since paintRect is not working properly in the new
blitbuffer as reported in #274.