OPAL-2393: Geo values summaries

## Isle of Man postal codes

![image](https://f.cloud.github.com/assets/2565497/2476337/0ecda2d4-b062-11e3-8871-b15e3b53e158.png)

## Stats on Polygon

![image](https://f.cloud.github.com/assets/2565497/2476347/340b99d4-b062-11e3-8ee4-def21e6d4e00.png)

## Stats on Multipoint

![image](https://f.cloud.github.com/assets/2565497/2476355/49ae41a6-b062-11e3-9827-aa8cde9735cf.png)

## Stats on MultiLine

![image](https://f.cloud.github.com/assets/2565497/2476359/569b41ca-b062-11e3-9ced-73d926db1149.png)

## Stats on MultiPolygon

![image](https://f.cloud.github.com/assets/2565497/2476365/648e85e4-b062-11e3-88b2-0d9755620ff3.png)