Fix for IIPServer style urls when using DZI.
Merge pull request #413 from esmondb/master

Fix for IIPServer style urls when using DZI.
Changelog for #413
Updated to latest npm packages
Bumping node version for travis
Fixed QUnit dependency
Removes unnecessary trailing commas which stops google's closure compiler.
Merge pull request #419 from esmondb/master

Removes unnecessary trailing commas which stops google's closure compile...
Fix memory leak while destroying the viewer.
fix .close() called after .destroy() + spacing
Improve comment for destroy() method.
Merge pull request #421 from henri-astre-msft/memory_leak

Fix memory leak while destroying the viewer.
Changelog for #421