ttbbeer 1.1.0

2016-07-10: 8 additional datasets for historical tax rates have been added. bump major revision.
2016-07-10: updated documentation for the package.

ttbbeer 1.0.0

2016-07-03: now on CRAN https://cran.r-project.org/package=ttbbeer
2016-07-02: initial upload to github repository with plans to submit to CRAN soon