Merge pull request #24 from amnonbb/master

Add libopus
Merge pull request #26 from amnonbb/master

add pkgconfig path to env
ffmpeg 2.1.3
Merge pull request #28 from KG7x/patch-4

Update to ffmpeg 2.1.3
Merge pull request #1 from stvs/master

ffmpeg 2.1.3