Czelta

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* autofit feature for station
* better tests
* config file can be in yaml
* date_to_timestamp evaluate timezone if present
* documentation on readthedocs.org
* much better coincidence finding (works for more than 3 stations, works over seconds

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* created class event (memory efficient, one event use only 23 bytes)
* created class event_reader
* created class station
* event_reader can load and save .txt and .dat files from web
* load data about stations from file
* event have method to calculate event direction (horizont, azimuth) based on station
* event_reader can filter events