Update to latest stable ffmpeg release: 1.1.2
Force fontconfig configuration on Mac OSX.

Somewhere along the line fontconfig stopped looking in the current
directory for the "fonts" directory that was packaged with PMS on
Mac OSX. Also, Apple stopped shipping X11 by default which changed
the font directories. As a result of both, fontconfig could no
longer find any fonts on Mac OSX.
Flag TODO for later.
Make FFmpeg display external subtitles.
(Requires FFmpeg version 1.1 or higher)
Correct constructor