Add option to change the name of method current_user

[brunoocasali]

Allow changing the name of current_user method to any other, this can be requested at config file. Because sometime a SimpleUser will be answer the survey, and a AdminUser will create a survey. In this case what kind of this users will be the current?

Just add a section in config file, if is not set return :current_user yet!

Thanks!

[iffyuva]

thanks for opening this issue. makes sense.

[stale]

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