Use hooked access callback.
Merge pull request #16 from adam-vessey/7.x-hooked-access

Use hooked access callback.
added travis file
updated README
Merge pull request #17 from philsogaDGI/7.x

Setup Travis and Tests
Carry through changes of Islandora constants.
Merge pull request #18 from adam-vessey/7.x-constants

Carry through changes of Islandora constants.