Mocktail and Content-Type

Here is file produced by `SWHttpTrafficRecorder`:

GET
//getFile.php\?filename=.*$
200
application/zip;base64
Content-Type: application/zip

As you see we have Content-Type = application/zip from request's header and also content type generated by recorder. With current `OHHTTPStubs` implementation first value ` application/zip;base64` will be overwritten by `application/zip` and base64 decoding will not happen. This leads to bug.

Could you tell me who is wrong is this situation, `OHHTTPStubs` or `SWHttpTrafficRecorder`?