fix issue with express 4.x issuing 304 (see https://github.com/swagger-api/swagger-node/issues/266)
fix issue with express 4.x issuing 304 (see https://github.com/swagger-api/swagger-node/issues/266)

Schoonology/swagger-tools,connected-rcheung/swagger-tools,smoebody/swagger-tools,schatt/swagger-tools,edu2004eu/swagger-tools,Schoonology/swagger-tools,connected-rcheung/swagger-tools,MaxKramnik/swagger-tools,apigee-127/swagger-tools,schatt/swagger-tools,smoebody/swagger-tools,edu2004eu/swagger-tools,apigee-127/swagger-tools,MaxKramnik/swagger-tools