docs(rxPaginate): new docs on hiding pagination

Address issue #206 

Did not add an attribute, but documented the simple ng-hide configuration to use to hide the pagination.

With multiple pages:
![image](https://cloud.githubusercontent.com/assets/706039/2934077/a94bcbb8-d7c9-11e3-8d3d-8841e3bcc816.png)

With a single page and pagination hidden:
![image](https://cloud.githubusercontent.com/assets/706039/2934080/b45990d0-d7c9-11e3-82e1-214374ea7b43.png)

I also made a small style tweak to allow the pagination background to take up the entire width of the table. 
Before:
![image](https://cloud.githubusercontent.com/assets/706039/2934103/fb63a07e-d7c9-11e3-9919-95957bf3a4ef.png)

After:
![image](https://cloud.githubusercontent.com/assets/706039/2934098/f2677694-d7c9-11e3-9b4c-28b5369040af.png)