#1511: geo-distance-filter in kibana filter list 

I have implemented a geo-distance filter. 

![kibana-geospatial-filter1](https://cloud.githubusercontent.com/assets/1858839/4451973/20d93216-483f-11e4-91c8-cabd3311b24b.JPG)
![kibana-geospatial-filter2](https://cloud.githubusercontent.com/assets/1858839/4451976/32b3ebf2-483f-11e4-86b7-375e63b2a3a5.JPG)
![kibana-geospatial-filter3](https://cloud.githubusercontent.com/assets/1858839/4451980/44e19874-483f-11e4-91d7-a95a011af66e.JPG)