mongoid/origin — pull request #103 by astjohn (2014-12-23 14:25:58+00:00)
Title: Add within_sphere and within_circle to geo_spacial.

Added `within_circle` and `within_sphere` queries to geo_spacial selector to handle mongodb's respective $center and $centerSphere queries.

This also fixes a small typo in the documentation for `intersects_polygon` and `within_polygon` regarding the number of brackets used (#102).