Some style guide fixes, docstring fixes and removal of unused imports in different modules. Rename acceptInvite view variable to accept_invite in soc.views.models.host module to comply to our style guide. Patch by: Pawel Solyga Review by: to-be-reviewed

from query import *
from subqueries import *
from where import AND, OR
from datastructures import EmptyResultSet

__all__ = ['Query', 'AND', 'OR', 'EmptyResultSet']