Document and export imfilter_LoG
Implement check for scalei property in scaleinfo_uint
core.md: make "scalei" a core property
writemime: convert Cmap images to direct (fix #113)
sum: strengthen typing on region to avoid DataArrays ambiguity
Remove simd macro fro imfilter_LoG
Fix ambiguity warnings
Add coveralls to travis.yml
Fix typo in travis.yml
Add coverage badge
Fix type inference on padarray
Change color slices to colorspace "Unknown"
Allow permutedims to work with tuple inputs
Overlay: default clim using limits, delete limits & colorspace properties

Also try harder to return an image from OverlayImage
io: for multi-image files, switch to interpreting as a timedim rather than spacedim

The motivation is that multi-image files are more commonly temporal sequences
(Think of all the GIFs posted online...)
If this breaks your code (sorry!): manually adjust the properties after calling imread.
Fix unit parsing in NRRD
Partial fixes for converting to Base.Cartesian
Fix buggy label_connected (fixes #115)

This also completes the conversion over to Base.Cartesian
Bump required version of Cartesian pkg
gitignore files created by precompilation