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Merge pull request #38 from lucasb-eyer/master

Add pixel value under cursor to statusbar.
Merge branch 'master' of git://github.com/timholy/ImageView.jl
Add viewlabeled
Use grayim in statusbar tests
Update for deprecations in Images
Add the ability to disable callback creation. Fixes #32.

This turns out to be a performance bottleneck, and also seems to
fix the growing memory usage.
In viewlabeled, use the same properties for the image and the label
Be more careful about bounds-checking. Fixes #45.
Added box annotations.
Merge pull request #47 from timholy/kms/box_annotation

Added box annotations.
Fix contrast GUI for Ufixed/Gray
Remove wanna-be triangular dispatch (fixes #50)
Fix off-by-one error in panning.