Added allowedClientClasses.

[rob-64]

Added allowedClientClasses array to allow a client to make a limited set of classes when allowClientClassCreation is false.

[codecov-io]

Current coverage is 92.01%

Merging #1853 into master will increase coverage by <.01%

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  Misses          509        509          
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[drew-gross]

I think the allowClientClassCreation setting covers this feature fairly well. In prod you can ensure the correct classes exist through the dashboard, then set allowClientClassCreation to false and then this new setting is unnecessary. Did you have some specific use case in mind that isn't covered by allowClientClassCreation?

[rob-64]

@drew-gross, I was trying to limit a malicious user from creating classes/data outside of the scope of my application. I actually had not thought of using the dashboard to setup non system classes before hand. I am fine with doing that and closing request.

[drew-gross]

Sounds good.