Deprecate old entities. Add query methods for getting data from datab…

…ase using Views

Major update of package. Remove unnesessary classes and remove word M…

…odel from other. Adding new base class for CouchDb components - Component.

Stability changes to CouchDbClient class.

- Add cookie authentication.

- Add proxy authentication.
- Add `authenticate()`, `logout()` and `userInfo()` methods to `CouchDbClient` class.
- Add related to authentication fields to `ServerModelResponse` class.

Third beta of library.

Second library's beta.

First library's beta.