make services.cleanup happen automatically (#224)

examples/hyperopt/driver.py

@@ -36,4 +36,3 @@ for i in range(samples):
     print "Best parameters are now {}.".format(params)
 
 print "Best parameters over {} samples was {}, with an accuracy of {:.4}%.".format(samples, best_params, 100 * best_accuracy)
-services.cleanup()

examples/imagenet/driver.py

@@ -34,5 +34,3 @@ if __name__ == "__main__":
   if args.drop_ipython:
     import IPython
     IPython.embed()
-
-  services.cleanup()

examples/lbfgs/driver.py

@@ -50,5 +50,3 @@ if __name__ == "__main__":
   result = scipy.optimize.fmin_l_bfgs_b(full_loss, theta_init, maxiter=10, fprime=full_grad, disp=True)
   end_time = time.time()
   print "Elapsed time = {}".format(end_time - start_time)
-
-  services.cleanup()