Trello: Filter/search chores (maybe also useful for other non-Trello chores)

[andreoliwa]

Most of these items might only make sense after #28.

• Filter cards only from lists Doing and Top --list 2
• Filter cards without label --no-label or --label 0
• Filter cards due soon --due soon
• Filter cards with label Skype --label skype
• Filter unassigned cards --no-member or --member 0
• Filter cards with more than one label --label +1
• Filter to include/exclude organizations, boards and lists, by name and/or id
• Save filters in the config file? (filter are saved searches)
• Filter cards due next week --due week
• Filter cards due next month --due month