Add a method to determine the orientation of a page based on its MediaBox dimensions and the presence of a Rotate property, if any.
Removing whitespace
Add spec for new method orientation()
Read all four MediaBox elements explicitly to calculate page dimensions, rather than assuming a value of zero for the first two elements.
Add tests for both portrait and landscape pages, with and without rotation
Adding sample files used to test page orientation
move page orientation detection into a dedicated class

* significantly easier to unit test
remove some unused spec PDFs
reduce the whitespace changes to integrity.yml
use a context block to make these spec lines < 100 chars

* so that the quality specs continue to pass on this branch
Merge branch 'page-orientation'
add point from Page#orientation specs to PageOrientation unit specs