Solve all flake8 warnings (#163)

Whipper is now fully PEP8 compliant.
Revised version which includes all the changes suggested by Freso.

whipper/command/accurip.py

@@ -26,6 +26,7 @@ from whipper.common import accurip
 import logging
 logger = logging.getLogger(__name__)
 
+
 class Show(BaseCommand):
     summary = "show accuraterip data"
     description = """
@@ -52,7 +53,6 @@ retrieves and display accuraterip data from the given URL
                     "Warning: response %d has %d tracks instead of %d\n" % (
                         i, r.trackCount, count))
 
-
         # checksum and confidence by track
         for track in range(count):
             sys.stdout.write("Track %d:\n" % (track + 1))