Use all host info to fill the hostgroup quickinfo bar

A quickbar showing only the status of 20 hosts (page predefined) doesn't make sense. It's confusing (the first time I saw the bar, I thougth that all my hosts were up) and useless (I can see the number of down hosts in a page with 20 rows without looking at the bar).

The bar should show up the total number of hosts down/up/warning, and should not change between page changes. Here's an example with a lot of hosts:
![all_hosts](https://cloud.githubusercontent.com/assets/3034812/4953478/60423546-6681-11e4-96a6-416d903f79ea.png)
This is, IMHO, the right way to help users to know about their infrastructure status in one shot. (No need to change between N pages, 237 in this case):

![all_hosts2](https://cloud.githubusercontent.com/assets/3034812/4953426/b418ba7e-6680-11e4-9159-c5291e31b692.png)

Thanks.