Pyhafas

* [feature] Parse leg remarks (25)
* [feature] Add KVB Profile (28)
* [feature] Add optional retry parameter for requests. You might activate retries with the `activate_retry()` function on your profile (31)

* [BUG] Fix setting of default user agent

* [FEATURE] Add timezone awareness to all datetime time objects
* [FEATURE] Allow filtering at `pyhafas.client.HafasClient.departures` and `pyhafas.client.HafasClient.arrivals` for direction station
* [FEATURE] Add option to `pyhafas.client.HafasClient.journeys` request to allow setting a maximum number of returned journeys
* [BUG] Fix bug with some HaFAS versions in platform parsing
* [BUG] Changed coordinate type from int to float
* Better dependency requirements (less specific versions)
* Add tests

* [BREAKING] Changed return format of `pyhafas.client.HafasClient.arrivals` and `pyhafas.client.HafasClient.departures` methods
* [BREAKING] Removed deprecated parameter `max_journeys` in `pyhafas.client.HafasClient.arrivals` and `pyhafas.client.HafasClient.departures` methods
* [BUG] Fixed `pyhafas.client.HafasClient.journey` request in VSN-Profile