def parse_rule_file(file)
      tags = []
      begin
        tag_text = File.read file
        tags = tag_text.split(/\s/)
      rescue
        raise "ERROR: Could not read or parse the specified rule file at #{file}"
      end
      tags
    end
def parse_rule_file(file)
      tags = []
      begin
        tag_text = File.read file
        tags = tag_text.split(/\s/)
      rescue
        raise "ERROR: Could not read or parse the specified rule file at #{file}"
      end
      tags
    end
given a filename parse any tag rules in that file

 @param [String] rule file path
 @return [Array] array of tag rules from the file