* Use alt text title as alt text for images when the alt text description is
blank or missing.
* Ignore v:imagedata elements without relationship ID with warning.
* Ignore bold, italic, underline and strikethrough elements that have a value of
false or 0.
* Handle absolute paths within zip files. This should fix an issue where some
images within a document couldn't be found.
* Allow style names to be mapped by prefix. For instance:
r[style-name^='Code '] => code
* Add default style mappings for Heading 5 and Heading 6.
* Allow escape sequences in style IDs, style names and CSS class names.
* Allow a separator to be specified when HTML elements are collapsed.
* Read embedded style maps.
* Add disableEmbeddedStyleMap() to allow embedded style maps to be disabled.
* Include embedded styles when explicit style map is passed.
* Handle hyperlinks created with complex fields.
* Support custom image converters.