Reorganize the vp8 directory.

The usual changes:
vp8/main/source -> vp8/
vp8/main/test -> vp8/test
vp8/main/interface -> vp8/include

All include paths etc. updated as needed.

BUG=none
TEST=trybots

Review URL: https://webrtc-codereview.appspot.com/704004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2536 4adac7df-926f-26a2-2b94-8c16560cd09d
32 files changed