added ability to specify input format
added inputstream error detection
Merge branch 'master' of https://github.com/smremde/node-fluent-ffmpeg into smremde-master

# By Stephen Remde
# Via Stephen Remde
* 'master' of https://github.com/smremde/node-fluent-ffmpeg:
  added inputstream error detection
  added ability to specify input format

Conflicts:
	lib/fluent-ffmpeg.js
Merge branch 'smremde-master'

# By Stephen Remde
# Via Spruce (Felix Fichte) (1) and Stephen Remde (1)
* smremde-master:
  added inputstream error detection
  added ability to specify input format