def start(task = :default)
      tasks[task] = { history: [], current: nil } unless tasks.keys.include?(task)
      stop task if tasks[task][:current]
      tasks[task][:current] = Time.now.to_f
      0
    end
def start(task = :default)
      tasks[task] = { history: [], current: nil } unless tasks.keys.include?(task)
      stop task if tasks[task][:current]
      tasks[task][:current] = Time.now.to_f
      0
    end
Start a new timer for the referenced task. If a timer is already running for that task it will be stopped first.

 @param [Symbol] task The name of the task to start.
 @return [Integer] Returns 0