Merge pull request #117 from RuralHunter/master

zh_CN translation update
Update lang/pt_PT.lang

Updated european portuguese language
libav: Skip invalid CTTS

Fixes #1496
Merge pull request #118 from andreus-sebes/patch-6

Update lang/pt_PT.lang
Make box blur twice as fast
Build zlib during configure or libav won't detect it during its configure
rpi: Fix build error with latest libav
Update lang/it_IT.lang

-Added the following missing translations:
 ! Missing translation for Chapters
 ! Missing translation for Movie title
 ! Missing translation for Title, Season, Episode
-Fixed some old translated strings
Merge pull request #119 from RedSquirrel87/patch-3

Update lang/it_IT.lang
Use librtmp as submodule
HTTP: Never use HEAD to ''open'' files over HTTP

Do a minima range query request instead
ps3: Try to estimate POC to fix incorrect picutre ordering

Fixes #1483
Update lang/ru_RU.lang

added new missing translations
Merge pull request #121 from pvc1/patch-5

Update lang/ru_RU.lang
Update German translation
ps3: Increase audio buffer size

Fixes #1451
New libav version

Fix lockup when playing some mkv files

refs #1470
New libav version

Fix issue with codec-data-private compression in matraoska

refs #1470
subs: fadein/fadeout time cannot be int16 only

refs #1470
Refactor some stuff related to subtitles.

We want to decouple the subtitle renderer from the video renderer