Release v1.5.0

1. rewrited (update) get_news() method. It was not working anymore. Now it includes in the results the field datetime and the description of the article. This feature required me to use python.dateutil package, but it works greatly. I removed the use of timezones because it could give troubles when sorting the papers (sometime parser detects timezones, other times not). The new get_news() method results more flexible, stable, rich and useful than the other, especially because from the html of google one can access the datetime.
2. included lexial_date_parser() method for parse with robustness the date and datetime filed from the results.
3. changed the .result(sort=True) feature to be used with both the results from google.com and news.google.com
4. made more Pythonic the methods in the classes
5. included a new test files for testing the new results lists