Import nestegg webm/mkv parser

Initial import of nestegg[1] parser lib, at commit 0d51131.

[1]: http://github.com/kinetiknz/nestegg
     commit 0d51131519a1014660b5e111e28a78785d76600f

Change-Id: I191d388b7e5140ef96624511ccdd65d0e183076d
24 files changed