Dataset Extent - Longitude Value Update

[abrown920]

To fix the issue with dataset extent improperly displaying locations, we need to update the bbox covering long180 line and use a longitude value of greater than 180 or less than -180 to make it show correctly on the map.

[kvuppala]

Related to GSA/data.gov#520

[kvuppala]

The bbox display issue is resolved, can be reviewed at the below datasets which had the issue before.

http://catalog.data.gov/dataset/climate-prediction-center-cpc-monthly-drought-outlook-mdo
http://catalog.data.gov/dataset/climatological-data-national-summary
http://catalog.data.gov/dataset/u-s-forest-service-hazardous-fuels-reduction-treatment-activities