adding shifu-plugin-spark
Update README.md
Merge pull request #34 from adityabits/develop

Develop
add shifu-plugin-guagua; mv TrainRequestProcessor to plugins
Merge pull request #35 from xxdev/develop

add shifu-plugin-guagua; mv TrainRequestProcessor to plugins
mv TrainRequestProcessor to plugin
Merge branch 'develop' of github.com:ShifuML/shifu into develop
Merge branch 'develop' of https://github.com/ShifuML/shifu into develop
cleanup
Fixed some issues.
Added PigNormalization code
Still need code cleanup.