Using README.rst as long description

* Using README.rst as long description
* Added README.rst to MANIFEST.in
Changed sqlalchemy dependency to >=0.8.0
Changed version to 0.1.1
Documentation
Python 3 support

Using 2to3 to provide python3 support.
Documentation
Version 0.1.2.b1
Fix bug with lazy='dynamic'

Attempts to fix issue, in which dynamically loaded SQLAlchemy relationship cause an exception because they are not properly converted to dictionaries.
Example:
class OfferPicture(db.Model):
    __tablename__ = 'offer_pictures'

    offer_id = db.Column(db.Integer, db.ForeignKey('offers.id'), nullable=False) # id магазина
    url      = db.Column(db.UnicodeText) # Адрес фото

class Offer(db.Model):
    __tablename__ = 'offers'

    name = db.Column(db.Unicode(), nullable=False)
    pictures = db.relationship('OfferPicture', primaryjoin="OfferPicture.offer_id==Offer.id", backref=db.backref('offer'), lazy='dynamic')