Use char type for circle_perimeter method for speedup
Use same cython directives for whole source file
Fix PEP8 issues
Merge pull request #412 from ahojnnes/draw-cython-directives

ENH: Some improvements to draw.
Merge branch 'master' of git://github.com/scikit-image/scikit-image

Conflicts:
	skimage/draw/_draw.pyx
Merge branch 'master' of git://github.com/scikit-image/scikit-image
fix comment
DOC: minor fix ellipse_perim.
Fix reference syntax for corner detectors
Merge pull request #473 from ahojnnes/feature-refs

DOC: Fix reference syntax for corner detectors.
Merge branch 'master' of git://github.com/scikit-image/scikit-image
DOC: add docstring for deprecation
Fix mistake in example
Merge branch 'docstring' of github.com:sciunto/scikit-image
add note for distance/angle convention. Thanks to Emre Safak.
replace hough() by hough_line() in doc
remove docstring
Merge pull request #475 from sciunto/docstring

Various docstring corrections + fix an example
workaround: convert `dtype(image)` to `image.astype(dtype)`
Merge pull request #477 from JDWarner/convert_dtype_to_astype

Use `image.astype(dtype)` instead of `dtype(image)`