Auto merge of #220 - larsbergstrom:homu_operators, r=Manishearth
Auto merge of #220 - larsbergstrom:homu_operators, r=Manishearth

Add an operators group

r?  @Manishearth

Manish, do you have any idea how I can test this without dropping things on their head? The goal here is to have a "role" for operators, separate from that of reviewers (even if it's the same thing under the hood) to let people self-retry without waiting for delegate permissions.

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rwaweber/saltfs,UK992/saltfs,servo/saltfs,ALikhachev/saltfs,rwaweber/saltfs,ALikhachev/saltfs,UK992/saltfs,setupminimal/saltfs,setupminimal/saltfs,rwaweber/saltfs,servo/saltfs,setupminimal/saltfs,ALikhachev/saltfs,UK992/saltfs