Adds the ability to export to PDF in A4 format & landscape orientation, plus to export images with relative paths.
Features
- Export to PDF A4 format and landscape.
- Export images with relative paths.
- Add custom html to the exported document.
- Changed the export method signature.
- Changed the export events signature.
- Added 'roots' option.
Fixes
- [Fix] #73 Export service does not export foreignObjects in nodes.
