[Server] YoutubeServer is not working properly with python2.7

[fqez]

YoutubeServer works fine with python3, but it's incompatible with python2.7 right now.
It needs to be refactored and it also needs a CMakeLists.txt file for its installation.

[fqez]

The PR #1001 solves the compatibility with youtubeserver and python2.7
Also I've modified it to allow the user to personalize a little bit more the component. It now offers:

• output path: where do you want the temporary files to be stored
• Video download format: in which format do you want the video to be downloaded
  if you want to know the available formats you only have to type: youtube-dl --list-formats [Youtube video URL]
• It also let you choose the framerate in which ffmpeg will process the video.
• Now you can terminate the youtubeserver process just pressing Ctrl+c on the keyboard.

TODO:

It rest to include the necessary dependencies into the JdeRobot deps, and include the information to generate a debian package for this server.

Here is a video showing how the server works

[aitormf]

solved with #1001