2015-11-09 v1.5.0 "Javan Whistling Duck"

  This release improves upon the VP9 encoder and speeds up the encoding and
  decoding processes.

  - Upgrading:
    This release is ABI incompatible with 1.4.0. It drops deprecated VP8
    controls and adds a variety of VP9 controls for testing.

    The vpxenc utility now prefers VP9 by default.

  - Enhancements:
    Faster VP9 encoding and decoding
    Smaller library size by combining functions used by VP8 and VP9

  - Bug Fixes:
    A variety of fuzzing issues