Added Content-Length to all error response headers where not present; mo...

...ved "req" code before proxy_client code in gateway.js file's "handler" method; fixed proxy_client error response headers logging comment; added error Event and Error throwing for audit service errors for improved logging; added err.stack logging where not present; increased proxy_client timeout value for ecrud core route in config file, added buffer ne strictLength with turned-off (i.e. "false") values to ecrud core route in config file.