Cookiedb

Aditions

- [`3b51b74`](https://github.com/jaedsonpys/cookiedb/commit/3b51b7411bebcc1b5fd10431542f47ac4eda958f): Adding method to delete items from database;
- [`0fbb070`](https://github.com/jaedsonpys/cookiedb/commit/0fbb0706a67bfaca50a1961c9f321d400368fd12): Adding license notice to files.

Aditions

- [`938a0e3`](https://github.com/jaedsonpys/cookiedb/commit/938a0e3ff0617fe86a8e052b72e5bdb65dbfe8e9): Creating `NoOpenDatabaseError` class in exceptions.py;
- [`4ad55de`](https://github.com/jaedsonpys/cookiedb/commit/4ad55def9d49c9ab7651b34934499a116ce6e114): Creating decorator to check if there is an open database.

Aditions

- [`d8d4b95`](https://github.com/jaedsonpys/cookiedb/commit/d8d4b95dca40ab1dac096e85a19878ffaa11c7ac): Adding ".cookiedb" extension to CookieDB files;
- [`a009f6a`](https://github.com/jaedsonpys/cookiedb/commit/a009f6a2aa000eb00bdf776088389f2d3aa84b13): Creating unit test using PySeqTest.

Fixs

- [`f2ff9dc`](https://github.com/jaedsonpys/cookiedb/commit/f2ff9dcdd203acf8b973c74e45197e79fbecdec8): Adding empty character filter from "path_list".

Aditions

- `CookieDB.create_database`: method to creating a database;
- `CookieDB.open`: method to open a database;
- `CookieDB.commit`: method to commit database changes;
- `CookieDB.create_item`: method to create item in database;
- `CookieDB.get_item`: method to get item from database.