Fix canny, various docstrings, and deprecation warnings

Merge pull request #673 from JuliaImages/teh/oneunit_depwarn

Fixes oneunit deprecation warnings in tests

More morphology splitting

Merge pull request #663 from juliohm/dilate-erode-wrappers

Extend dilate/erode for ImageMeta

ImageMorphology

Merge pull request #661 from juliohm/image-morphology

Add ImageMorphology as a dependency

Fix restrict

Merge pull request #656 from JuliaImages/teh/restrict_655

Fix range construction in restrict. Fixes #655

Otsu threshold, blob_LoG, delete old deprecations, and require 0.6

Merge pull request #648 from JuliaImages/teh/elim_deprecations

Eliminate old deprecations and require 0.6

IO control

v0.10.1

whitespace fixes

Percentile (and quite a few other changes)

Merge pull request #617 from JuliaImages/teh/expunge_percentile

Expunge `percentile` and `method` as (keyword) arguments from Images API

Get working on julia 0.6

Merge pull request #615 from JuliaImages/tk/compat

need Compat 0.19 for IndexStyle

canny and convexhull

Merge pull request #611 from shashi/patch-1

Bump Compat version

Improvements in imresize and gaussian_pyramid

Merge pull request #596 from JuliaImages/Evizero-restrict

Some changes to gaussian_pyramid and clahe (plus #589)