Merge pull request #3 from DannyJoris/7.x

addressed code review issues by Daniel Lamb
Not whitescreening on pages that are missing their parent issue.
Merge pull request #5 from willtp87/7.x

Not whitescreening on pages that are missing their parent issue.
made callback compliant with new seadragon function call
Always using tokens for djatoka authentication
Merge pull request #7 from daniel-dgi/token

Always using tokens for djatoka authentication
updated sample objects with correct page cmodel