delete Rpresenter for the work "CLT for mean"
Merge branch 'master' of https://github.com/gdwangh/coursera-dataScientists-9-Developing-Data-Products

Conflicts:
	courseproject/part2-Rpresenter/weatherEvent/weatherEvents-rpubs.html
add file .Rprofile to solve the Rpubs publish SSL problem.
update course project part 2 R presenter
add slidify slides for course project part 2
add .cache to part2-slidify course project part 2
Merge branch 'gh-pages' of https://github.com/gdwangh/coursera-dataScientists-9-Developing-Data-Products