Add NationalGrid Feeds

[gregjurman]

Add feeds from NationalGrid.

*https://www1.nationalgridus.com/StormCenterData/data/data_ny.xml
*https://www1.nationalgridus.com/StormCenterData/data/data_ma.xml
*https://www1.nationalgridus.com/StormCenterData/data/data_ri.xml
*https://www1.nationalgridus.com/StormCenterData/data/data_nh.xml

[gregjurman]

Scraper is done, currently testing. NationalGrid NY is added to the main page.

[gregjurman]

NationalGrid changed data backends. This broke the scrapper.