Code cleanup
Remove type hinting to permit updates.

Overly strict type hinting was preventing hook_islandora_object_alter()
from using the create_alias function. The type hinting could be
restored if ISLANDORA-1073 is addressed, and
hook_islandora_object_alter() were to get the modified version of the
object.
Merge pull request #6 from rosiel/7.x

Bug fix! and some cleanup.