Added:
	PigStats
	DI for multiple type of stats
	UnivariateStats
	Unit test for UnivariateStats
	
Modified:
	Changed spacing to 4 spaces instead of tabs
	
Still needed:
	Clean up tests so only test UDF.
Merge branch 'develop' of https://github.com/ShifuML/shifu into develop
cleanup
Fixed some issues.
Added PigNormalization code
Still need code cleanup.
Code cleanup:
	Make stats spi fit the model set in core for binding different types of
stats calculators
	Remove misc/undeed code
Fixes:
	Modify core to accept List<RVO> and List<Numeric> for stats calculation
Needed:
	More code cleanup
Further code cleanup. Might need to create multiple model.xml files to
handle different stages of pmml build.
Fix for initial stats generation
raw initial model
Skipping automated tests for now. Will fail due to lack of installation
of jar in main project. Please run manually by uncommenting @Test in
files.
Merge pull request #37 from raoulcjohnson/develop

Develop