Converted height and width constants to numeric
Converted height and width constants to numeric

ppound/islandora_bookreader,ajstanley/emic_bookreader,islandora-deprecated/islandora_bookreader,MorganDawe/islandora_internet_archive_bookreader,ajstanley/emic_bookreader,Islandora/islandora_bookreader,islandora-deprecated/islandora_bookreader,Islandora/islandora_bookreader,Islandora/islandora_bookreader,islandora-deprecated/islandora_bookreader,ppound/islandora_bookreader,MorganDawe/islandora_internet_archive_bookreader