shifu-core:
1. SPI: change Trainer interface and return the trained model.
2. core.container: add SVMParams for svm model
3. core.pmml: fix bug in PMMLCommonUtil in pmml folder
shifu-plugin-*
 add test cases for PMML adapter, add EncogLRTrainer.
1. add test cases for Mahout Adapters
2. change test/resource folder structure
Update README.md
clean code, add comment, add licence information
commit PMMLIntegrater, SparkConfiguration, and SparkLRParams, which are
all supplementary classes for shifu-plugin-*
change to a better test dataset
commit missing input files
supplementary dataset
Merge pull request #19 from lisahua/develop

Change Trainer SPI-return trained model & Add test cases for Encog and Spark PMML adapter