I've fixed several bugs (issue #889 and issue #897), added features found in other formatters (background color optionally applied, line highlighting enabled), and added new features (the ability to mark a line added or deleted, as well as controls for styling these lines).
I've fully documented the changes in the fork wiki to ease the process of reviewing this merge. I hope this is helpful.
The commit history is quite messy - apologies. It may be desirable to simply apply this as a patch.
These features have been requested of the minted LaTeX package (I am not officially affiliated with minted in any way - I am just one of the people who would like these features).