Fix bug (issue 438) - is_m3u doesn't work if http in path
added reading covers from ID3v2 tags
added fetching cover from flac files. also added code to convert coverts to jpeg.
Changed stategy for fetching album's covers.
Some small fixes.
Fixed charset corrector bug, when some unicode symbols be converted into illegal cyrillic symbols.
Some PEP-8 fixes.
Removed unused methods. PEP-8 warnings fixed.
Partially resolved issue #419. Added save selected tab in music perspective. Also added save for last active playlist.
Fixed app freeze after closing playlist's tab. Config save moved into thread.
Fixed switching perspectives by hotkeys.
Fixed config saving in thread. start_new_thread replaced by gobject.idle_add()
Some small fixes.
Fixed seek bar clearing on drop playlist with radio streams
Merge remote-tracking branch 'origin/id3v2_covers'