reviewed and some code by: Albert Astals Cid <aacid@kde.org>

        * glib/poppler-page.cc:
        * glib/poppler-page.h:
        * glib/poppler.h:
        * glib/test-poppler-glib.c:
        * poppler/Makefile.am:
        * poppler/PageTransition.cc:
        * poppler/PageTransition.h:
        * qt/poppler-page-transition.cc:
        * qt/poppler-page-transition.h: Move Page Transition parsing from qt
        frontends to poppler core. Expose Page transitions on the glib
        frontend.