go back to 3.2.1 in master and create branch for 3.2.2
apply changes in 3.2.2 for unsupported modules
apply changes in 3.2.2 for officially supported modules, except CholmodSupport.h
Eigen/src/Sparse/* are no longer needed at least from 3.1.4
update version number of Eigen in README.md
changelog for wrap() improvement
logs of updating Eigen to 3.2.2
should be as() rather than wrap()
add more unit tests to reflect change in as() exporters
change for as() exporters
Merge pull request #13 from RcppCore/feature/eigen3.2.2

Feature/eigen3.2.2