removed dependancy on winston

default to no logging - can still use winston if the user passes a
winston logger using the args
added smremde as contributor
merged forked repo
Revert "merged forked repo"

This reverts commit 671f576e715a170ec872d1673f9d2804edc27a12.
Never use .apply and instead give FfmpegCommand as parameter
move requiresMetaData to correct location
cleanup of mergeToFile

remove async.min and added async as dependency
fixed #133 (removing intermediate files before starting)
making fs calls async
added progress to mergeToFile

close #134
mergetoFile: check if output already exists
corrected totalfiles
Merge branch 'master' of https://github.com/smremde/node-fluent-ffmpeg into smremde-master

added me as contributor
# By Stephen Remde
# Via Stephen Remde
* 'master' of https://github.com/smremde/node-fluent-ffmpeg:
  Revert "merged forked repo"
  merged forked repo
  added smremde as contributor
  removed dependancy on winston

Conflicts:
	package.json
Merge branch 'smremde-master' into polishing-code

# By Stephen Remde
# Via Spruce (Felix Fichte) (1) and Stephen Remde (1)
* smremde-master:
  Revert "merged forked repo"
  merged forked repo
  added smremde as contributor
  removed dependancy on winston
Merge branch 'polishing-code'

# By Spruce (Felix Fichte) (5) and Stephen Remde (4)
* polishing-code:
  mergetoFile: check if output already exists corrected totalfiles
  added progress to mergeToFile
  cleanup of mergeToFile
  move requiresMetaData to correct location
  Never use .apply and instead give FfmpegCommand as parameter
  Revert "merged forked repo"
  merged forked repo
  added smremde as contributor
  removed dependancy on winston