FFMPEG now default

also added mkv as extension
Merge pull request #50 from imageio/movie2

FFMPEG now default
induce style error to test detection
style fail now?
style fail now?
correct style again
better handling of nan and inf in image_as_uint8
Merge pull request #51 from imageio/style

induce style error to test detection
Backport changes from v1.0+docs
Allow resources inside the package structure

We keep a special directory for local resources.
Then we can create wheels for distribution that have
the FreeImage lib and a couple of images inside this
directory.
add environment arg to disallow internet fecting. tests are aware of it
add images to wheel dist
added distutils command to generate archives for each plat