small fixes (no functionality)
Added avbin plugin
make things work on Windows
small fix in ico test
Merge pull request #22 from imageio/win

make things work on Windows
ffmpeg tests
style
more robust closing
Merge pull request #23 from imageio/ffmpeg

ffmpeg tests
style fixes
Merge pull request #20 from rreilink/avbin

Added avbin plugin
check avbin_decode_video result code != -1

fixes issue 25
Merge remote-tracking branch 'upstream/master'