Removes remove_broker method

The remove_broker method is unused and has been removed. This functionality is handled by the remove_broker_by_uuid method.

Fixes #270
Removes @web_command logic

Since the API has been separated from the CLI, the logic regarding @cli_private, @options[:jsoncommand] and @web_command are no longer necessary and have been removed.

Fixes #271
Merge pull request #274 from mtnbikenc/issue-270-remove_broker

Removes remove_broker method
Merge pull request #275 from mtnbikenc/issue-271-remove-web_command

Thanks!