Add ImageTokenRequest.java type to pass token in the request header.  Add getWithToken() to ImageLoader.java to request images with this request type.

Signed-off-by: oneEyedOdin <oneEyedOdinDev@gmail.com>
Merge branch 'imageLoader_with_authToken' of https://github.com/oneEyedOdin/Volley into imageLoader_with_authToken