Initial commit
Added existing script file.
Set mode on yt-dashload: 755
Silly whitespacing adjustment.
Added various checks
* Added command line parameter count check
* Added ffmpeg check
* Added youtube-dl checks
Added a link to the youtube-dl project in the readme file.
Fixed possible issue with certain output names.
Added error messages in case something goes wrong.
Added more messages.
Improved temp-file naming pattern.
Added check if the output file exists already.
Added basic usage help.
Improved readme

* added description
* added dependency list
* added usage help
Added missing video formats into the priority list.
Added hybrid support for avconv.
Updated README.md (we now have avconv support).