Added Melange front page edit view where you can change title, content, feed url. Created SiteSettings and Document models and some logic for them. Added isFeedURLValid function in soc/logic/feed.py. Created some functions for handling datastore updates of different kinds of Models (soc/logic/model.py). Fixed some typos and too long lines of code. Patch by: Pawel Solyga Review by: to-be-reviewed

"""
Django validation and HTML form handling.

TODO:
    Default value for field
    Field labels
    Nestable Forms
    FatalValidationError -- short-circuits all other validators on a form
    ValidationWarning
    "This form field requires foo.js" and form.js_includes()
"""

from util import ValidationError
from widgets import *
from fields import *
from forms import *
from models import *