Create a requirement for a minimum poke length to be counted

[KravitzLab]

This is now implemented as a variable:

• minPokeTime: Int, minimum duration for a poke to count, in ms. Initializes to 0. Example usage:
  

fed3.minPokeTime = 1000;                               //Set minPokeTime to 1000ms
if (fed3.leftInterval > fed3.minPokeTime) {            //Check if the left poke held longer than minPokeTime
      fed3.Feed();                                     //Feed 
}