Fixing doc typo in station history parser.
Changed weather parser to allow temp_min and temp_max to be optional.
Adding parsers for station and station list.
Adding station object for handling meteostations along with XML name schema for station objects.
Adding station and station list parsers to configuration.
Adding station_at_coords method for listing meteostations closest to the specified geo-coords.
Adding station object unit tests and expected outputs in the json and xml formats.
Adding functional tests for station listing nearest to geo-coords.
Correcting doc comments for station object and station list parser.
Fixes compatibility issue in exception handling for station parser.
Removing old station json dump test data.
Minor modifications, mostly in comments
Merge pull request #57 from csparpa/feature/#49_stations_close_to_geo_point

This fixes issue #49