Added epub export function
Fixed a bug into PHPePub with special caracters
Big changes for epub export. Now possible to do it from a tag, a category and a search. Also, improved ebook rendering.
Changed template organisation
Many improvements to epub produced : better cover, better tags
Added translation capabilities for epub system
Merge branch 'dev' of https://github.com/wallabag/wallabag into epub
Fix bugs and improved epub rendering
Better names for epub files and epub in all themes now
Merge branch 'epub' into dev

Conflicts:
	themes/baggy/home.twig
Cleaned epub fonction
Fix for #678
Merge pull request #697 from tcitworld/dev

Up-to-date with me