Merge pull request #2539 from popcornmix/new_stall2

[rbp] Some bug fixes, logging and tidying relating to buffering.

diff --cc xbmc/cores/omxplayer/OMXAudio.cpp
Simple merge

diff --cc xbmc/cores/omxplayer/OMXPlayer.cpp
Simple merge

diff --cc xbmc/cores/omxplayer/OMXPlayerAudio.cpp
Simple merge

diff --cc xbmc/cores/omxplayer/OMXPlayerVideo.cpp
Simple merge

diff --cc xbmc/cores/omxplayer/OMXVideo.cpp
Simple merge