Improved Wells Fargo module stability.

Signed-off-by: Oleg Plakhotniuk <olegus8@gmail.com>
Always raise instances of NotImplementedError
pep8 fixes, modernizations

autopep8 -a -r -i --select E711,E712,W601,W602,W603,W604,W690,E304,E401,E502 .
Also includes some manual reindentations (many are left after the print()
changes).
Manually checked, some modernizations not commited here.
Remove tuple method parameters

They can be found through autopep8 (W690) or python-modernize.
Variables manually renamed.

This is because Python 3 does not support tuple unpacking:
http://legacy.python.org/dev/peps/pep-3113/
Add ignore dirs for flake8
pep8 blank lines fixes

flake8 --select W391,E302,E301,E304

autopep8 can't fix W391 even though it claims it can.
Fixed using a simple custom script.
imgur: Restrict URL to imgur domains

Otherwise it would crash any pastoob get!
unsee: Restrict URL to unsee domains

Otherwise it would crash any pastoob get!