init
1. add StepFunction
2. refactor initializer
3. prorotype of Lambda_hat.gen
remove pkg files
update technical note
add gamma.hat.gen and related configuration and tests
shift the code write before and prepare to re-implement b_i.hat
implement b.hat.y
caching
finish 2nd-version of Wang2001
correct typo
remove library micro benchmark
implement Huang2004
add TODO to make it compilable
correct \gammma
add gamma.hat for Huang2004
implement psi_3i.y.gen
implement Huang2004
implement rao.cache for rao
implement beta.hat
implement V1.hat
Merge remote-tracking branch 'origin/master' into refactor-wush