Merge branch 'opus-update'

.gitignore

lib/native/linux-64/libjnopus.so

lib/native/linux/libjnopus.so

lib/native/mac/libjnopus.jnilib

lib/native/windows-64/jnopus.dll

lib/native/windows/jnopus.dll

src/native/build.xml

...tive/opus/org_jitsi_impl_neomedia_codec_audio_opus_Opus.c

...tive/opus/org_jitsi_impl_neomedia_codec_audio_opus_Opus.h

src/org/jitsi/impl/neomedia/codec/audio/opus/JNIDecoder.java

src/org/jitsi/impl/neomedia/codec/audio/opus/JNIEncoder.java

src/org/jitsi/impl/neomedia/codec/audio/opus/Opus.java