Update README.md

Changed rant to crant
Changed $R --vanilla to $R --no-save --no-restore

Some users may install packages in a non-default directory which is specified in the .Renviron or R site script. With the --vanilla switch, these files are not read so the required package is not found.
Merge pull request #24 from alko989/master

Update README.md
Merge pull request #25 from eev2/master

Changed $R --vanilla to $R --no-save --no-restore
Install multiple package types
Updated README
Make sure to clean up
Setup toolchain
Use jar for unzip if necessary
Add switch for cleaning up files
Default dependencies to true
Support other CRAN-like repos
Support comments
Exit with success
Debug
Add perl support
Update prefix
Exit success
Debug
Undebug