Added the github issue comment for the hadamard product optimization
Added OneR
Added a negation optimization of the Hadamard product
Handling of OneR in Product
Merge branch 'develop' of github.com:twitter/scalding into feature/optimizedmatrix
Changed SizeHint to use BigInt, added the J matrix test case
Addad a G^k V optimization test
Added copyrights
Added an expression Map for reusing joined types
Changed HashMap to Map and Product's hashcode
Added comments, plus negate exposes expressions
G^k and G^K V revised
Added the Hadamard product SizeHint estimation
Simple optimized scalar ops added
Added ComputedScalar
Comment on power
wrapped negate of Product
Hadamard product SizeHint tests
Wrapped the Hadamard Product joining
Scalar apply instead of from