add web action to get object annotations

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
add class for the action that gets annotations

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
hide RayCloudBrowser.cgi from the client

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>