do not crash on months with no transactions
[razibus] add favicon
[boobot/twitter] fix purge system
Add unique id to creditcooperatif (perso)
tests: Use the Python SkipTest if possible

This makes nosetests optional at least in theory.
Recent nose versions already do the same thing internally.
boilerplate: Remove useless __all__
Remove useless __all__ in modules

They bring nothing of value (we never use import * anyway) and introduce
a maintenance burden.

The __all__ that I left might not be very useful either but at least
they are not a pain to maintain; they are also used by pyflakes in some
cases.
Put back wrongly removed __all__
limit length of password
let get_currency guess US$ means USD
add a way to customize sign handling for CleanDecimal
add a way to asynchronously handle requests and pages
ability to set value to an empty string if it is available in choices
[mareeinfo] add new module mareeinfo
require python-concurrent.futures only when needed
fix parsing of torrent titles
Regexp: let template be a callable
add some javascript dedicated filters
minor fix of JSVar
setup: Add futures, avoid Py2-only libs under Py3