Spatial search

* [x] import OSM data
* [x] leaflet map
* [x] spatial search on ES to show results within map extent as a list (on map moveend)
* [x] searchRecords in daybed.js
* [x] unit test for searchRecords

Works well, but wait for https://github.com/spiral-project/daybed/issues/266 to reach production before merging!
![selection_487](https://cloud.githubusercontent.com/assets/546692/4997231/496bfbc8-69cd-11e4-83cc-3d84b3e11738.png)