commit Spark LR trainer and Mahout trainer

1. shifu-core
1) change shifu-core akka from version 2.1.1 to 2.2.3
2) comment out QuickSortTest.testPerformance() function
2. shifu-plugin-encog
1) Spark LR trainer.TODO Spark Config json
2) Mahout LR, NN trainer, PMMLAdapter, MLModel