Httprest

Added
* Support for HTTP timeouts

Fixed
* `HTTPResponse.ok` is now a property as was planned originally

Added
* `http.HTTPError` exception
* `HTTPResponse.raise_for_status` method
* `API.__str__` method

Changed
* Split `http.base` module into separate modules like `response.py` and `errors.py`
* HTTP exceptions are now importable as `http.errors`

Added
* `http.auth` module. Support for Basic auth
* `params` argument for the `HTTPClient.request` to simplify query parameters usage
* `cert` argument for the `HTTPClient.request` to allow client side certificates

Added
* `http.fake_client` module

Added
* `http.requests_client` module

Added
* Initial version