islandora_delete_object() now follows function description.

islandora_delete_object() no longer throws. Now it will only return TRUE if
successful, FALSE otherwise as expected.

This fixes the issue where solution packs were not reinstalling existing objects.
Added the ability to preview a print page for a given object.
Merge pull request #281 from nigelgbanks/7.x-print-menu

Added the ability to preview a print page for a given object.
Merge pull request #284 from nigelgbanks/7.x-solution-pack-issues

islandora_delete_object() now follows function description.