change the way we spec PageState
change the way we spec PageState

* how the matrix is stored and multiplied is really an implementation
  detail, so it's better to check the results indirectly via the API
  external collaborators will use

yob/pdf-reader,eitoball/pdf-reader,yob/pdf-reader,tardate/pdf-reader,boutil/pdf-reader,nifarius/pdf-reader,nmadura/pdf-reader,gordonbisnor/pdf-reader,yob/pdf-reader,tdenovan/pdf-reader