In the CSOM documentation on MSDN (http://msdn.microsoft.com/en-us/library/jj246523.aspx) it looks like the SP.GroupCollection.add method has a REST endpoint:
When I try to Access this uri I get page not found so I guess it has not been implemented?
Does anyone know if it is possible to create new groups and assign permissions to them using the REST api? I know I can do this with CSOM, but I'm trying to get this to work from a workflow. :-)