Improve style…
simplify some code
show off iterators
Merge pull request #185 from nwin/master

some improvements
Fix potential crash caused by channels4()
Implement Index trait for Pixel implementations
Implement IndexMut trait for Pixel implementations
Merge pull request #187 from b52/master

Fix potential crash caused by channels4()
Merge pull request #188 from b52/convenience

Implement Index and IndexMut for Pixel implementations
Add a few optimization hints #189
fixes #186
Merge pull request #191 from nwin/master

fixes #186
Added opt-in Copy implementations
Merge pull request #193 from bvssvni/master

Added opt-in Copy implementations
Fixes #192

get/put_pixel was broken
Merge pull request #196 from nwin/master

Fixes #192
add benchmark
suppress warnings
Merge commit '2d9d4595936469acb2dd5683766fcc07ab099cc3'
fixes 198