Rename: owm25.weather_at -> owm25.weather_at_place
Rename: owm25.API_online -> owm25.is_API_online
Add test
Rename: owm25.find_weather_by_name -> owm25.weather_at_places
Rename: owm25.find_weather_by_coords -> owm25.weather_around_coords
Rename: owm25.weather_history -> owm25.weather_history_at_place
Update README.md
Merge pull request #33 from csparpa/feature/#20_naming_review

Feature/#20 naming review