1. change test cases hierarchy structure
2. add readme.md
Update README.md
Update README.md
Update README.md
Update README.md
initial commit for mahout PMML adapter and trainer
commit the change for pom.xml
1. Spark LR model trainer - change shifu-core pom.xml akka version to
2.3.3
2. Mahout LR model trainer, Mahout NN trainer
3. Mahout LR and NN PMML adapter and MLBuilder
Merge remote-tracking branch 'upstream/develop' into develop

1. add Spark LR trainer
2. add Mahout LR and NN trainer
3. add Mahout LR and NN PMMLAdapter as well as MLBuilder
change akka version from 2.1.1 to 2.2.3
comment out QuickSortTest.testPerformance() and build shifu
Merge pull request #17 from lisahua/develop

commit Spark LR trainer and Mahout trainer
1. shifu - pom.xml: add plugin modules: shifu-plugin-spark,
shifu-plugin-mahout
2. shifu-core: 
	a) add ml.shifu.core.plugin.pmml package for the plugin interfaces.
	b) add ml.shifu.core.plugin.pmml.PMMLModelTest which is the abstract
test cases for all pmml model test cases.
3. shifu-plugin-*: update pom.xml and separate dependency
exclude akka in shifu-core in shifu-plugin-spark due to the version
conflict.
commit MahoutLRTrainerTest
revert akka version from 2.2.3 back to 2.1.1. Guagua fails at akka
version 2.2.3
Merge pull request #18 from lisahua/develop

Revert akka version back to 2.1.1, exclude akka in plugin-spark
split dtrain to one module, old code still in shifu-core to make sure shifu run successfully
resolve conflicts