Reorder OG roles

#5753 

The role Basic Member will always be first on the list,
and the role Administrator will always be last on the list.
All other roles will be between these two.

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Screenshots
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Before:
![reorder1](https://cloud.githubusercontent.com/assets/3273122/2644921/3181b994-bf2d-11e3-80ed-b22ad6e24842.png)

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After:
![reorder2](https://cloud.githubusercontent.com/assets/3273122/2644922/37e91d54-bf2d-11e3-9013-a0247009eadd.png)