Add new image buffer
Merge branch 'master' into replace_imgbuf
Replace old with new color types

Note: this broke DynamicImage
replaced image buffer

tests are broken
fixes tests
remove trait bound
export typedefs
Merge commit 'd329ef50738655a2dfb03f94022fe116421fb09e' into replace_imgbuf

Conflicts:
	src/image.rs
Forgot into_raw
wrong index :(

maybe use destructuring…
fixes according to some comments
didn't save
update function to  "preferred" method
Merge pull request #180 from nwin/replace_imgbuf

[breaking change] Replace imgbuf with ImageBuffer