Link to HTTP API documentation
Make these private
Eliminate reflection warning
Strip Windows line endings
Better function name
Extract function
Refactor to not have variadic functions
Add langohr.http/user-exists?
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Bump RabbitMQ Java client
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Add langohr.http/vhost-exists?
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Rename langohr.http/declare-user to add-user

Users are not declared in RabbitMQ parlance. This also matches
rabbitmqctl command.
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Typos
Rename langohr.http/declare-permissions to set-permissions

Matches rabbitmqctl and HTTP API terminology.
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Rename langohr.core/declare-policy to langohr.core/set-policy
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