Orientation option for wrapper

[Boutnek]

To make it possible to generate a dynamic page size and orientation "on the fly", it would be very nice to have the following extra parameters available in the wrapper's "getpdf" function:
$paper_size
$paper_orientation

It is easy to edit this my self, but composer updates erase all the enhancements on new deployments. So it would be very nice to have these options build in inside this repository.
Thanks in advance.

[ndench]

I ran into this issue to and created a PR for it: #14