Move `image_output` to `util`
Stubs for `image_input`
Rename `cinfo` to `info` for consistency
Main JPEG reading routine
Stubs for `Image::fromBuffer`
Transfer read data into an Image
Free more memory
Merge branch 'master' into image-read

Conflicts:
	Makefile
Merge pull request #21 from merlinND/image-read

Read a JPEG image