Open Graph in ChronoZoom. Fixed #326, Fixed #64, ExceptionalIO.
added test for bug https://github.com/alterm4nn/ChronoZoom/issues/482
Merge pull request #488 from a-chumagin/master

[Hot pull] added test for bug
Merge pull request #487 from javierluraschi/ExceptionalIO

Open Graph in ChronoZoom. Fixed #326, Fixed #64, ExceptionalIO.
fix BL tests
Merge pull request #490 from a-chumagin/master

BL: Fix tests
Fix #493: HTTP 500 error when navigating to collection
Merge pull request #496 from javierluraschi/Fix493

Fix #493: HTTP 500 error when navigating to collection