Release 3.0.1

[onizet]

All bug fixes:

• Ensure to count existing images from header and footer too Invalid document when html contains images and existing headers/footers contain images #113
• Preserve line break pre for OSX/Windows
• Prevent a crash when the provided style is missing its type
• Defensive code to avoid 2 rowSpan+colSpan with a cell in between to crash Table with ColSpan, empty cell inserted after wrong cell #59