move Nugget class into web.py and use SQLAlchemy
implement id from uri/text in new Nugget class
fix up TestWeb for SQLAlchemy
change import of IngegrityError for sqlalchemy
move Nugget class into models.py
remove obsolete (non-flask) tests
move Task object from core to models
remove old sqlite backend
remove old schema
update README
add search bar from example at textfixer.com/tutorials/search-box-examples
implement searching (searches for one word only)
implement updating of nuggets (rudimentary)
implement nugget deletion
update README