Generated Curl output doesn't escape double quotes on headers (possibly on everything)

Eg. Token authentication header 

```
header "Authorization", ActionController::HttpAuthentication::Token.encode_credentials("mytoken")
```

Generated curl:

```
curl "http://somehost/someurl" -X GET \
-H "Authorization: Token token="mytoken""
```
