Allow processors (inc. paypal rest) to not support cancel recurring#210

michaelmcandrew wants to merge 2 commits intoeileenmcnaughton:mastereileenmcnaughton/nz.co.fuzion.omnipaymultiprocessor:masterfrom

michaelmcandrew:paypalrest-cancel-recurring-fixmichaelmcandrew/nz.co.fuzion.omnipaymultiprocessor:paypalrest-cancel-recurring-fixCopy head branch name to clipboard