add djvu render mode options in readermenu
fix #995 by reseting readertoc on init
fix #970
by rendering full page if bbox is larger than native page size when
zooming mode is fit to content*
Merge pull request #997 from chrox/fix_995

fix #995 by reseting readertoc on init
Merge pull request #996 from chrox/djvu_render_mode

add djvu render mode options in readermenu
Merge pull request #998 from chrox/fix_970

fix #970
Merge pull request #999 from Frenzie/master

Changes for Kobo Aura H2O.