Few quick updates

New splitting code brought back from Chrome Print Experiment.

Fixes the download and stream methods.

Before in the event that a simple basic conversion was performed and
then, streamed or downloaded to the browser. The generated PDF contained
a PHP exception. Because the "tempDocument" didn't actually exist.

We also changed the way we delete the temp documents.
This is done via a destructor now for the entire class.

more updates to unit tests

We now have the download and stream methods completed.

Okay I give up... with the unit tests for now.

I cant for the life of me work out what is going on it all works
flawlessly locally but on travis is fails. Will setup a vm locally
and test on ubuntu but for now I am moving on.