fixed bug for epub export #755 ; also better metadata title
added email field
precision
Translations
changes in all themes
little fix
Improved instructions
Merge pull request #771 from tcitworld/refactor

fixed bug for epub export #755 ; also better metadata title
Fix #766 - GD detection
Fix the PostgreSQL install errors
merge refactor and dev
Merge branch 'refactor' into dev
Merge pull request #841 from wallabag/fixGDdetection

Fix #766 - GD detection
Merge pull request #802 from tcitworld/traductionfix

Traductionfix
get up to date for merge
Merge branch 'dev' of https://github.com/wallabag/wallabag into dev
Merge branch 'issue-844' of https://github.com/rros/wallabag into dev
fix for #758
Merge branch 'dev' into password-hash