Creating overall Facility Management Panel

Summary of changes:

* Added independent pagination for students and coaches
* Changed language to 'coaches' rather than 'teachers' throughout
* Merged facility management and facility usage page
* Easy selection of users
* Movement of users between groups, removal from groups, deletion.
* Minor fix for set_default facility

![image](https://f.cloud.github.com/assets/1680573/2509003/c3fa22d0-b3e7-11e3-8162-addcb68bd086.png)