Add geospatial query types

[dkarlovi]

Q	A
Bug report?	no
Feature request?	yes
BC Break report?	no
RFC?	yes

Elasticsearch supports geo queries. Doctrine ODM supports geo queries.

Might want to add a type which would allow for geo-queries. This would allow later support for it in Elasticsearch and probably Doctrine integrations.

[sstok]

Depends on #211