Merge branch 'library-dev'

Conflicts:
	configure_ffmpeg.sh
added note about needed the latest versions of automake, autotools-dev, and libtool

* Building for Android needs very recent versions of config.guess and
  config.sub to properly support android.
additional filters supported, better MediaDesc impl
new filters
Merge branch 'master' of github.com:guardianproject/android-ffmpeg
Add license information