Merge pull request #50 from skeptical/webfilters

Look for ffmpeg.webfilters in the profile directory contd
Formatting
FFmpeg updates:

 - Added new TranscodeVideo option X264TSAC3
 - Video stream muxing works
 - Improved logic for choosing whether to specify audio bitrate
 - Removed getCustomArgs since it wasn't being used for custom args
Formatting
Adjust FFmpeg updates for FFmpegWebVideo