ffmpeg-php extension News

* Added ability to open movies as persistent resources. This greatly increases speed of repeately accessing the same movie from separate php scripts (as when pulling each frame as an image on a webpage). (tkirby)
* Track frame number within ffmpeg-php since ffmpeg's decoder context seems to give inaccurate frame number on some 3gp movies. (tkirby)
* Fixed bug #1099229 - Stride problems if ffmpeg_frame is resized upwards (tkirby)
* Functions now use safe_emalloc() to avoid possible integer overflows (tkirby)
* Changed lrint() to a macro to allow compiling on Windows. (tkirby)
* Increased strictness of compiler warnings to catch issues like undefined symbol errors. (tkirby)
* Fixed undefined symbol errors some people were seeing.
* Fixed error handling when ffmpeg_movie object creation fails (tkirby)