BACKLOG-1330 roles for current IDP

Added screen to view persons that have the "SURFconextbeheerder" and the "SURFconextverantwoordelijke" role within the current IDP.

![screen shot 2014-05-27 at 16 25 11](https://cloud.githubusercontent.com/assets/104943/3092623/c2ae68e2-e5aa-11e3-930a-2c142ea51be6.png)