GeoDataFrame support and unittesting

This update includes a geodataframe output. The format and syntax are the same; you set the output parameter equal to one of 3 values:

1. 'geodateframe'
2. 'geoframe'
3. 'gpd'

Here is the syntax:

events = gd.Search(['2017 May 23','2017 May 25'],table='events',output='gpd',normcols=True,coverage=True)

And the major difference is the above code adds a geometry column. That means, it's possible to perform geosptial operations on this data (merge with shapefiles or other georeferenced data).

• Enhancements
  • Removed date_parse sniffer from the dataframe read to speed up ingest/converstion
  • normcols parameter lets you normalize the columns for ingest into a sql database