This version adds support for History API with some new, cool features
* New exception: `weatherly.InvalidDate`, raised from `weatherly.get_historical_data` when the date is invalid
* `client.get_historical_data` assuming that *client* is an instance of `weatherly.Client` : you can now get historical forecast data as `ForecastData` object
* `weatherly.ForecastData.iter_hours` : an iterator that lets you easily iterate over every hour data from the class.
Improvements to the documentation:
* Added `.. container:: operations` handling with custom CSS and JS. This directive is used for desribing operations for a class, function etc.