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This version includes:
- export of ROI coordinates along with pixel intensities [257](https://github.com/ome/omero-iviewer/pull/257)
- modify scalebar to display user-friendly lengths [253](https://github.com/ome/omero-iviewer/pull/253)
- link to current viewport available via context menu [240](https://github.com/ome/omero-iviewer/pull/240)
- fix caching of image settings on Save to All [255](https://github.com/ome/omero-iviewer/pull/255)
- fix thumbnails loading [246](https://github.com/ome/omero-iviewer/pull/246)
- do not change the centre of the viewport when using 1:1 [247](https://github.com/ome/omero-iviewer/pull/247)
- fix loading of ROIs when playing movie [249](https://github.com/ome/omero-iviewer/pull/249)
- fix permissions issue when loading pixels intensity [250](https://github.com/ome/omero-iviewer/pull/250)
- handle large numbers of ROIs on image [231](https://github.com/ome/omero-iviewer/pull/231)
- drag and drop thumbnails to open image viewers (not supported on Internet Explorer) [233](https://github.com/ome/omero-iviewer/pull/233)
- support URL query parameters for x, y and zoom [236](https://github.com/ome/omero-iviewer/pull/236)
- fix scrolling of thumbnail panel to selected image [234](https://github.com/ome/omero-iviewer/pull/234)
- fix resizing of rectangles after dragging [229](https://github.com/ome/omero-iviewer/pull/229)
- fix double-click zooming when in drawing mode [228](https://github.com/ome/omero-iviewer/pull/228)
- update to use version 5.3.0 of OpenLayers [218](https://github.com/ome/omero-iviewer/pull/218)
- this removes the need for closure compiler in the build