Update openseadragon to the latest version 🚀

[greenkeeper]

Version 2.4.0 of openseadragon was just published.

Dependency	openseadragon
Current Version	2.3.1
Type	dependency

The version 2.4.0 is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

It might be worth looking into these changes and trying to get this project onto the latest version of openseadragon.

If you have a solid test suite and good coverage, a passing build is a strong indicator that you can take advantage of these changes directly by merging the proposed change into your project. If the build fails or you don’t have such unconditional trust in your tests, this branch is a great starting point for you to work on the update.

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Release Notes

v2.4.0

• BREAKING CHANGE: Viewer's canvas-double-click event is now fired before it initiates the zoom (#1288)
• You can now flip the viewport to get a mirror image of the original (#1441)
• You can now prevent canvas-double-click events from zooming on a per-event basis (#1288)
• Fixed: Opacity 0 images were causing unnecessary redraws (#1319)
• The "page" event is now fired after the page index has been updated (#1330)
• Added option pixelsPerArrowPress that sets the speed of arrow keys (#1364)
• Improved IIIF options.maxLevel calculation (#1401)
• Added canvas-key events, along with the ability to cancel key actions (#1414)
• Added optional zoom in the middle of the image instead of pointer position (#1423)
• Now supporting square edge tiles that are padded rather than cropped (#1426)
• Fixed an issue causing the simple image tileSource to sometimes show duplicate copies (#1370)
• Fixed an issue causing seams to appear in semi-transparent PNG tiled images (#1470)
• Added visual customization options for the navigator (#1480)
• You can now prevent canvas-drag events on the navigator (#1484)
• You can now prevent canvas-click events on the navigator (#1416)
• The navigator can now be restricted to just horizontal or just vertical panning (#1416)
• Fixed DziTileSource so it doesn't load levels above maxLevel or below minLevel, if set (#1492)

Commits

The new version differs by 118 commits.

• 446af4d Version 2.4.0
• 2bc102d Merge pull request #1492 from openseadragon/dzi
• 071b865 Tweaks to minLevel DZI patch
• 452e50c Making the DziTileSource honor minLevel.
• 68d08d8 Merge branch 'master' of github.com:openseadragon/openseadragon
• 890d9bc Changelog for #1416.
• 47e95b4 Merge pull request #1416 from francescocretti/hotfix/minimapClick
• e1bb981 Changelog for #1484.
• 7b73768 Merge pull request #1484 from francescocretti/hotfix/minimapDrag
• 9c2211f Merge branch 'master' into hotfix/minimapClick
• ed16908 Doc minor fix and trailing space removed
• 0bdc2df Documentations corrected
• 02ddb7a preventDefaultAction in canvas-drag on minimap
• 2eb6eaf preventDefaultAction support
• 0043956 Merge pull request #1479 from alanaberdeen/master

There are 118 commits in total.

See the full diff

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