ignore ..Rcheck
added comments for R stuff and less email sending
documented
added .Rbuildignore file
documented
Merge branch 'dev' into r_cmd_check

* dev:
  added .Rbuildignore file
  documented
  added comments for R stuff and less email sending
  ignore ..Rcheck
white space
removed mathjax local support to make it R passable
deleted mathjax dir