little fixes

- logger might be a private attribute
- compare rdate to date, not to today
use recent firefox user agent
add module creditdunord
enable check of certificate
do not support other kind of account histories than CPT
on page to update user information, raise BrowserIncorrectPassword
support market page (but do not display any history)
ignore card credits all the time
merge LoginPage and Login2Page to prevent problems when the website fails with 500
[creditmut] transfer now accepts long and short IDs
[isohunt] bug if leech or seed is empty corrected
[piratebay] bug on empty result page corrected
[wordreference] works now, dirty fix for a dirty website
[wordreference] make result cleaner
[wordreference] lazy programming correction
remove unused variable
fix pyflakes/flake8 issue

date is imported as a module, avoid using it as a variable.
also PEP8 fix.