move test sqlite files into test directory
add Backend class to act as interface for backends
add basic tests for add_nugget and get_nugget
remove default location from Sqlite
web: add bones of web interface
add create option to constructor for Sqlite
add test for previous commit
add default backend to User and remove imports from sqlite to prevent circular imports
flesh out structure of add_confirm
User: modify backend default logic
fix typo in add_confirm