Instead of having username/password on the signature:
https://github.com/aerogear/aerogear-ios/blob/matzew_afn121/AeroGear-iOS/AeroGear-iOS/security/AGAuthenticationModule.h#L163-L164

let's use a similar approach to our enroll:
https://github.com/aerogear/aerogear-ios/blob/matzew_afn121/AeroGear-iOS/AeroGear-iOS/security/AGAuthenticationModule.h#L143

That way developers can pass in the credentials like:

@{@"myFooNameForUser":@"john",@"passywordy":@"123"}

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