add forms, cases, and users viz to the global project space report

Visualizations in global project report.

Behavior:
Shows visualizations with project space filters if the report returned 10 or fewer project spaces.
Shows aggregate visualizations for project spaces matched by facets it < 500 project spaces
Shows aggregate visualizations for total project spaces (not just those matched in report) if > 500 project spaces

![screen shot 2013-09-03 at 1 37 27 pm](https://f.cloud.github.com/assets/1201876/1074681/eb60925e-14bf-11e3-8f00-1e47600724c7.png)