GeoShape Filters 

Cause the ElasticSearch GeoShape filters are awesome and the [other pull request](https://github.com/ruflin/Elastica/pull/412) seems dead.

The GeoShape pre-indexed and provided filters, documented [here](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-geo-shape-filter.html#query-dsl-geo-shape-filter).

With unit tests