def level(level, context = nil)
      context = context.to_s unless context.nil?
      self.levels[context] = level
      clear_levels_cache!
    end
def level(level, context = nil)
      context = context.to_s unless context.nil?
      self.levels[context] = level
      clear_levels_cache!
    end
Public: Set the lowest level of message to log for the given context.

 level   - The lowest level of message to log for the given context.
 context - The context that level applies to (default: nil).

 Setting a level for nil sets the default level for all contexts that have
 not been specified.

 Returns nothing.