add warning for when content_type mismatch
add warning for when content_type mismatch

jdandrea/pecan,StackStorm/pecan,StackStorm/pecan,citrix-openstack-build/pecan,ryanpetrello/pecan,jimrollenhagen/pecan,jimrollenhagen/pecan,pecan/pecan,ryanpetrello/pecan,pecan/pecan,jdandrea/pecan,citrix-openstack-build/pecan