Add order_by_without_select option for activerecord near scope

Rails 4.1 does not drop added selection columns on count queries
(only on .count(:all)). This parameter adjusts the scope in the way
that the records are filtered and ordered by distance but the distance
is not select separatly. So .count still works with rails 4.1.

Addition to #630
Merge remote-tracking branch 'upstream/order_by_without_select'

* upstream/order_by_without_select:
  Add order_by_without_select option for activerecord near scope