Change shebang to use /usr/bin/env python3

Depending on the user's setup, python3 may not be in
/usr/bin, especially if they use something like
Homebrew, which uses /usr/local/bin. Using `env`
works around this, and is more likely to find a working
python3 installation.
Use /usr/bin/env python3 in cherrymusicserver package (#450)
automatically hiding notifications after 5 seconds, closes #449
Merge branch 'devel' of github.com:devsnd/cherrymusic into devel
added feature to see the number of subfolders and tracks inside folders

this behavior can be deactivated by setting

   media.show_subfolder_count = False

in the configuration
fixed tests
fixed search bug, that degraded the search quality immensely
made file search live tweakable
implemented sub file count estimation, so that huge folder don't take long to be displayed in the client
improved listview display to play nicer together with added subfolder count
fixed track title not being shown in progress bar, closes #454
support chars that need encoding in playlist names when browsing
Merge pull request #456 from marianosimone/devel

support chars that need encoding in playlist names when browsing, closes #384
fix shuffle button update when adding tracks to playlist. Closes #399
Merge pull request #458 from marianosimone/devel

fix shuffle button update when adding tracks to playlist. Closes #399
redeploy for #399; using unminified jplayer in source, because it is going to be minified later anyway