In Python 2, __repr__ and __str__ shouldn't return unicode.
This caused a problem for example when logging-debug a filter on Thumbnail.url,
as the logger couldn't encode the unicode repr.

flake8 --select W391,E302,E301,E304

autopep8 can't fix W391 even though it claims it can.
Fixed using a simple custom script.

Signed-off-by: Pierre Mazière <pierre.maziere@gmx.com>

Ref e7805cec

Allowing future use with upcoming VideoStream

Signed-off-by: Pierre Mazière <pierre.maziere@gmx.com>

Signed-off-by: Pierre Mazière <pierre.maziere@gmx.com>

for web site providing audio streams

Signed-off-by: Pierre Mazière <pierre.maziere@gmx.com>

Remove useless trailing \
Remove trailing spaces
Add missing empty lines

autopep8 -ir -j2 --select=E301,E302,E502,W291,W293,W391 .

Diff quickly checked.