Add the macros for communication with a remote R server#214

Merged

goehle merged 2 commits intoopenwebwork:developfrom cubranic:rserve-macro

May 31, 2016

+271

Commits on May 30, 2016

Add the macros for communication with a remote R server
cubranic
committed
Allow for question writer to specify the width and height of the image
cubranic
committed