messing with date range finder.  WIP

Still a WIP for the date range finder. The mongo db geospatial indexing is completed. The parameters passed through a post via '/api/findevents' will be in the form:

{
  maxD: NUMBER_OF_DEGREES_AWAY_FROM_POINT_OF_INTEREST,
  loc: [LONGITUDE, LATITUDE],
  date: {
             year: YEAR,
             month: MONTH,
             day: DAY
          }, // this is a work in progress
  daysToSee: NUMBER_OF_DAYS_TO_VIEW  //still WIP as well
}