Update the file upload sample to use an async result.

Signed-off-by: Clement Escoffier <clement.escoffier@gmail.com>
Update chameleon's version to 1.10.1

Signed-off-by: Clement Escoffier <clement.escoffier@gmail.com>
Fix #285

Signed-off-by: Clement Escoffier <clement.escoffier@gmail.com>