Yi Luo authored May 17, 2016 and James Zern committed May 18, 2016

- Integrate 5 flip transform types for each 4x4, 8x8, and 16x16
  block, for experiment, EXT_TX.
- Encoder speed improves about 12%-15%.
- Update the unit tests for bit-exact result against C.

Change-Id: Idf27c87f1e516ca5b66c7b70142477a115404ccb