text: Title: [FR] FollowPath should get a log_interval setting
  Body: Hey guys,
  
  ![image](https://cloud.githubusercontent.com/assets/335238/18411370/8eb31390-774c-11e6-8200-6b60051b2c9b.png)
  
  How often do you guys use `FollowPath`?
  `MoveToFort` has a `log_interval` setting.
  Would be really nice to have the same setting on `FollowPath`
  so as to reduce the log overload
  
  What do you guys think?
  