Calculate optimal amount of workers

[eygraber]

Add a class that calculates the optimal number of workers to use, based on the algorithm in JCIP.

[eygraber]

int calculateNumWorkers(int numCPUs, float targetUtilization /* > 0 && <= 1*/, float waitTimeToComputeTime) {
   return numCPUs * targetUtilization * (1 + waitTimeToComputeTime);
}