open images specified by URL
read tiled tiffs
read tiled tiff of any sample type (hopefully)
supress libtiff warnings
enable files downloaded by https
remove commented, unused or otherwise dead code
disable compression when saving large TIFF
fix typo (compression was disabled for small TIFF)
one:WxH semantif filename
Merge branch 'master' of https://github.com/carlodef/iio
save int-valued images
save int pngs (woth loss of precision)
read images into int arrays
minor fix to make piio.read/write compatible with unicode strings

example:

    piio.read(u'/tmp/lena.png')

now works, as well as:

    piio.read('/tmp/lena.png')

You don't need to type:

    piio.read(str(u'/tmp/lena.png'))
change piio's iio