Allow multi ringed shapes to be used for $geoWithin.

Add a way to specify minDistance to $geoWithin allowing querying for being in a ring shape, analogous to what $near/$nearSphere allowed with $minDistance and $maxDistance options.

The only current workaround if $geoNear aggregation stage cannot be used is this query:

{$and:[

  {$nor:[

     {center:{

        $geoWithin:{$centerSphere:[ [ <x>,<y> ],<minDistance-in-radians>]}

     }}

  ]}, 

  {center:{

        $geoWithin:{$centerSphere:[ [ <x>, <y> ],<maxDistance-in-radians>]}

  }}

]} 

Original description:

With the deprecation of count in favor of countDocuments it is no longer possible to use the $near operator with the new API.

Unfortunately the alternative $geoWithin $center only supports radius whereas $near allowed having a ring specified by $minDistance & $maxDistance.

There's no workaround for this, $geoWithin seems to only supports single ringed structures, so this might be more a server issue than a driver one.