export itemsPerPage and totalItems to a template of the paginator

Hi, please review my pool request. It allows to create of pagination templates more flexible.
e.g.
```
<div  >
  <span> {{(pagination.current - 1) * pagination.itemsPerPage + 1 }}-{{pagination.current * pagination.itemsPerPage }} of {{pagination.totalItems}}</span>
  <a href="" title="Switch left" ng-if="directionLinks"
     ng-class="{ disabled : pagination.current == 1 }" ng-click="setCurrent(pagination.current - 1)">&lsaquo;</a>
  <a href="" class="g-switch-right" ng-class="{ disabled : pagination.current == pagination.last }"
     ng-click="setCurrent(pagination.current + 1)">&rsaquo;</a>
</div>
```

It will be look as
![paginator](https://cloud.githubusercontent.com/assets/6583360/5436047/7ecec6c6-846a-11e4-8e1d-4ea2042e969c.png)

For now it's not possible.