allow winston 0.7 transports
allow winston 0.7 transports

If a Winston 0.7 transport is passed in, log messages have " undefined" appended to them.  Fix.
nwah/express-winston,hairyhenderson/express-winston,G33kLabs/express-winston,beamly/express-winston,hharnisc/winston-express-middleware,floatingLomas/express-winston,bithavoc/express-winston,bithavoc/express-winston