boilerplate for webp read
Merge remote-tracking branch 'origin/master' into webp
basic webp load done
added webpsave boilerplate
add save functions
read webp input with mmap
oops
support webp lossless encoding
sync
Merge pull request #71 from lovell/master

Use directory-exists check rather than file-exists check
any number of bands for hist_local
im_stdif() -> a class

also many bands support
move hist dispatch to deprecated
im_project() becomes a class
support greyscale tiff with alpha

thanks Robert for pointing out this omission
Merge branch 'webp'

Conflicts:
	ChangeLog
	TODO
support plane-separated data in tiff read

though only for strip images, needs some more testing
oops
error in header read
invertlut fix