show query time and total number of shuffle in viz

Show query time and total number of shuffled tuples in the first page of visualization.

solve #136 

![screenshot 2014-06-15 14 41 17](https://cloud.githubusercontent.com/assets/720571/3282080/d36144ea-f4d5-11e3-9fdf-93e2f538422e.png)

Does this mean that the statistics are always visible? Could you make it part of the query overview template? Test the link:

![screen shot 2014-06-15 at 21 57 18](https://cloud.githubusercontent.com/assets/589034/3282654/a6aaedc4-f4f9-11e3-9f65-9c6d8b6c63ad.PNG)