Live mode update delay

From the config comment:

  // Wait this many milliseconds between evaluating input.
  // In effect this should have similar properties to non_blocking mode but
  // without using threads, save more resources and work in Sublime Text 2.
  //
  // live_instant_interval dictates the minimum time between (near) instant
  // evaluations on new input. When the file first receives input the evaluation
  // is always instant, after which live_instant_interval time must pass before
  // the next input is evaluated instantly again.
  //
  // live_continuous_delay dictates the minimum time between delayed evaluations.
  // If input is continuous (faster than the live_instant_interval interval) then
  // GitGutter will wait this long before evaluating.
  //
  // Has no effect with live_mode disabled or non_blocking enabled.
  // Set live_delay to false to evaluate after each input with no delay.
  "live_delay": true,
  "live_instant_interval": 200,
  "live_continuous_delay": 400