camptocamp/cgxp — pull request #844 by ger-benjamin (2014-08-20 09:59:24+00:00)
Title: Sum of geom in FeatureGrid

As the title says it.

Picture:
![sum_geom](https://cloud.githubusercontent.com/assets/1792111/3979110/937bf13c-2850-11e4-9df5-483342b4a251.png)