v2.0.0

1. Renamed the following types and methods, so the they are more consistent to their keyword counterparts and easy to remember.

   • Query.Selector -> Query.SelectBy

   • Query.selector() -> Query.selectBy()

   • Query.Orderer -> Query.OrderBy

   • Query.orderer() -> Query.orderBy()

   • Query.Grouper -> Query.GroupBy

   • Query.grouper() -> Query.groupBy()

2. Deprecated two functions DISTANCE_IN_KM() and DISTANCE_IN_MI(), but introduced DISTANCE(), which is more flexible since units are passed as parameters instead.