Strip silence from tracks, fix regression

[tobinus]

Here's a summary of my changes:

• Fix regression caused by FMA/CloudFlare blocking requests with urllib2's default User-Agent.
• Strip silence from the beginning and end of each track (0.3 seconds of silence is left at the end).
• Create a makefile, which shall be used for running the program (stripping silence is implemented using makefile).
• Write instructions on how to set up.
• Make FMAdownloader.py compatible with Python3 (while retaining compatibility with Python2)
• Include information about progress in FMAdownloader.py.
• Prompt for API key and create settings.py automatically if it doesn't exist already.

How to upgrade

$ sudo apt-get install sox libsox-fmt-mp3
$ git pull
$ mv tracks/*.mp3 downloaded_tracks
$ make run

If you've added the script to crontab, you'll need to edit the crontab entry to match the new way of running the script (make -C path/to/FMA-playlist run). See the example in README.md.

[boyeln]

kult!