added new default format classes for common video and audio formats
added codec compatibilities for various audio and video codecs, added addVideo and addAudio filter functions

- also added empty docblocks
fixed ouput option bugs
fixed bug in audio _processOutputFormat
fixed bug where trying to check for invalid command notation
added removed and change deprcated to status
added basic filter abstract class
updated/added basic examples
updated documentation to reflect changes to command status details