Move ARD, Arte, ZDF into their own files
[arte] Mark dead code as such
Move YoutubeSearchIE to the other youtube IEs
Move gametrailers IE into its own file
Move GenericIE into its own file
Move GoogleSearchIE into its own file
Remove useless headers
Move YahooSearchIE to youtube_dl.extractor.yahoo
Move blip.tv extractors into their own file
Move MyVideo into its own file
Move comedycentral into its own file
Add import for google search
Move G+ IE into its own file, and move google search into a more descriptive module
Split FileDownloader in two classes: FileDownloader and YoutubeDL

YoutubeDL is the class that coordinates everything
FileDownloader gets a filename and an info dict and downloads the video.
Use the new class in the tests